* Use char.IsAsciiLetter in the Regex runtime

Need to move the duplicated IsAsciiLetter method to just the source generator, since the source generator can't reference the char API. That way the runtime doesn't need to pay for a duplicated method.

* PR feedback.

Move helepr method to Stubs.cs.

* Fixing when trying to call mono functions in a non wasm page

* Adding a log message as suggested by @radical

Also adds property name serialization for TimeSpan, TimeOnly, DateOnly, Uri and Version built-in converters.

Fix #77326

Problem was that a BGC was in progress when the full GC was requested by setting the last_gc_before_oom flag, and at the end of the BGC we turned off the last_gc_before_oom flag.

Fix is simply not to turn off the flag in the case of BGC.

Co-authored-by: NAman Khalid <58230338+amanasifkhalid@users.noreply.github.com>
Co-authored-by: NEugenio Peña García <70240915+EugenioPena@users.noreply.github.com>

The implementation was previously being (arguably overly) defensive about allowing the cancellation token to keep alive a connection that had otherwise become stagnant while awaiting underlying stream operations that would never complete.  This adds some overhead, causes issues for some tests, and doesn't solve meaningful problems, so we're removing it.

This is a regression from NETFX with the introduction
of collectable assemblies in .NET Core 3.1 (dotnet/coreclr#20919).

* Use u8 in Utf8Formatter date formatting

This is primarily about code simplification and reduction, but it also helps to avoid a few array allocations and speeds up DateTime formatting by 5-10%.

* Delete assert erroneously left over

* Add XxHash3

* Add more XxHash3 test cases

* Cull back volume of test cases, and line wrap to help editor performance

* Address PR feedback
Co-authored-by: NEugene Sirkiza <esirkiza@microsoft.com>

Co-authored-by: NBrian Bohe <brianbohe@microsoft.com>

Set DOTNET_CLI_DO_NOT_USE_MSBUILD_SERVER=1

* [tests] Disable test running out of memory on Android x86

* [tests] Disable failing TestIcuAppLocal on windows

* Extend active issue for android

* Disable failing WasmTestOnBrowser test

* Add DiagnosticSource.Write<T> API to assist with trimming

Fix #50454

* Add tests

Introduce pgostress job that runs weekly instead of daily and move most of the runtime-coreclr pgo scenarios to this job. Scale back on win-arm/win-arm64 testing in pgo, libraries-pgo and jit-experimental. Clean up jobs in general based on new defaults.

* Remove nopgo run

* Remove dynamicpgo and set TC_QuickJitForLoops=1 explicitly in defaultpgo. Since this is default in x64/arm64 the only difference was in x86/arm32, and I don't think TieredPGO+QuickJitForLoops=0 is important enough to warrant a full run. 

* Remove jitosr_pgo, jitpartialcompilation_osr, jitpartialcompilation_osr_pgo. These are equivalent to other configurations with the current defaults.

* Remove fullpgo_random_edge in favor of just fullpgo_random_gdv_edge

* Update jit-experimental's timeout to be in line with the PGO job timeout, given that this is running priority 1 tests and frequently times out too.

* Scale back win-arm32 and win-arm64 testing in pgo, libraries-pgo and jit-experimental. Run fewer of the scenarios in these pipelines under win-arm and win-arm64 since these queues are relatively weak, and the differences to the JIT between these configurations and linux-arm/linux-arm64 are relatively minor.

[main] Update dependencies from 7 repositories

Co-authored-by: Ndotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

Co-authored-by: Ndotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

Co-authored-by: NJan Kotas <jkotas@microsoft.com>

We are currently hitting issues when there are diffs in the FileCheck tests because they are recorded with JitStdOutFile and the SPMI driver does not override this correctly. Add this and a lot of other environment variables to the list of variables we do not record.

This big list of string compares may look somewhat scary but we only query the config once during startup of the JIT, so it isn't a problem. I was not able to measure anything significant when collecting a simple "Hello, world!" C# app.

Co-authored-by: NAdam Sitnik <adam.sitnik@gmail.com>

* Use IndexOfAny{Except}InRange in RegexCompiler / source generator

This augments our existing use of IndexOf, IndexOfAny, and IndexOfAnyExcept to also support IndexOfAnyInRange and IndexOfAnyExceptInRange.  That means, for example, we can now efficiently find the start of a pattern like `[0-9]{5}`, via a vectorized search, whereas previously it'd require iterating character by character in a scalar loop.

As part of this, I changed some tuples to instead be named structs.  They were becoming unwieldy, and we expect we'll be adding even more here as additional IndexOf variants become available.

* Address PR feedback

And add a bit more test coverage

* Adding Readme.md for DirectoryServices.Protocols and Regex libraries

* Apply suggestions from code review
Co-authored-by: NStephen Toub <stoub@microsoft.com>

* Update README.md

* Apply suggestions from code review
Co-authored-by: NBuyaa Namnan <buyankhishig.namnan@microsoft.com>

* Apply suggestion
Co-authored-by: NStephen Toub <stoub@microsoft.com>
Co-authored-by: NBuyaa Namnan <buyankhishig.namnan@microsoft.com>

Fix missing ifdef FEATURE_EMULATED_TLS introduced by #73216 for Android Arm64

* Target only net7.0 during source-build
Port of #75168 to main.

* Target net7.0 in additional projects

* Update compatibility suppressions

* Only target net7.0 for source-build

* Disable package validation for source-build

* Revert compatibility suppression changes

* Use NetCoreAppCurrent instead of hardcoding net7.0

* Revert mono Apple TFM change

* Remove unnecessary LangVersion

* Address code review comments.
Co-authored-by: NLogan Bussell <loganbussell@microsoft.com>

* Add README docs for XML libraries

* Address feedback