This reverts commit 8cb4e934.

repPrintObjectDescription was not null-terminating when the map was
null. There is SPMI error trap on the JIT side so we can just make it
fail on missing data.

repGetStringLiteral should not succeed on missing data, it is used for
optimization purposes.

* Eliminate temporary -1 on Socket.Unix.cs

* Add ReadOnly{Observable}Collection/Dictionary.Empty

* Revert XamlLoadPermission.cs change to fix downlevel build

Akin to #73067

* [mono][interp] Improve GETITEM_SPAN intrinsic

Field offsets are known at compile time, they don't need to be included in the code stream.

* [mono][interp] Add version of getitemspan that doesn't use indirection

* [mono][interp] Add general MonoSpanOfVoid struct and use it in interp opcodes

Not just the promoted ones.

Co-authored-by: NDan Moseley <danmose@microsoft.com>

* JIT: Use metadata names for SIMD intrinsic method recognition

eeGetMethodName is only expected to be used for diagnostics.

* Reorder checks in impSIMDIntrinsic

* Suggested refactoring

* Avoid unnecessary metadata lookups in getMethodNameFromMetadata

* Fix nested lookup

* Fix repGetMethodNameFromMetadata

Android library tests were not running on CI in runtime-extra-platforms.
This PR brings back the jobs that ran library tests on Android device/simulator removed in #76328
They are updated to follow the similar changes made to branch out runtime-extra-platforms in the aforementioned PR.

* Stop using GenTree::ReplaceWith
* GenTreeRetExpr now directly contains its substitution members, which
  is a tree either from the inline candidate, a local (due to spill
  temps) or the call itself (due to inliner failure). In the former
  case, it also contains the BasicBlock the child tree comes from to
  ensure that its flags can be propagated once and for all during
  substitution.
* Make various members strongly typed, e.g.
  GenTreeRetExpr::gtInlineCandidate is now a GenTreeCall*,
  InlineCandidateInfo::retExpr is now a GenTreeRetExpr*. This is
  possible since we are no longer using GenTree::ReplaceWith.

Fix #75827

* [wasm] Fix Wasm.Build.Tests with stable 7.0.0

Set the manifest package version to use (`7.0.0` instead of `7.0.0-ci`)
early.

Fixes https://github.com/dotnet/runtime/issues/76908 .

* Misc fixes based on review feedback

Fixes https://github.com/dotnet/runtime/issues/73758 .

* Update WorkloadBuildTasksDir to remove 'publish' in the path

* workloads-testing.targets: ignore symbols.nupkgs when looking for runtime packs

* Fix WBT to have the correct version for WORKLOAD_PACKS_VER

* [wasm] Emit an error if PackageVersionForWorkloadManifests property is not set

* workloads-testing: Get the PackageVersion at build time

.. because it is not set at evaluation time. So, get it in a target, and
move the WorkloadIds to a target too.

* Ensure the version is set before generating the runscript for WBT

[ppc64le] Implementation of mono_arch_get_delegate_virtual_invoke_impl method for ppc64le architecture (#77308)

* [ppc64le] Fixed thunk address 8 byte alignment issue

* Fixed FSharp crash issue

* [ppc64le] Implementation of mono_arch_get_delegate_virtual_invoke_impl method for ppc64le architecture

This function is never used.

The concrete method cannot be looked up so 'cmethod' is still the interface method.

Related: https://github.com/dotnet/runtime/pull/76724.

It turned out that my recent change to redefine __int64 on Unix is
actually correct for macOS only. For other 64 bit Unixes, the __int64
should be defined as long.

This change fixes it.

A race condition when the object header is transitioning to a sync block can cause a concurrent recursive `TryEnter` to return false.

Fixes https://github.com/dotnet/runtime/issues/76660

* Remove uses of PAL's swprintf_s from mono.

* Add new version of the ContentionStart event and a LockCreated event

The new ContentionStart includes a lock ID, associated object ID, and the holding thread ID. The LockCreated event includes a lock ID and associated object ID.
Co-authored-by: NKoundinya Veluri <kouvel@microsoft.com>

* Fix dotnet-pgo dump

* Fix merge compare-mibc and create-mibc too

* A couple more fixes

Currently the ld linker links incorrectly the compiled thunktemplates.S
for ARM64 and puts wrong offsets into all the LDR instructions. Only
the LLVM lld linker works correctly.

I have looked into it and it turns out the assembler was putting in
relocations that the linker then replaced by fixed offsets. That's
where the GNU ld made the mistake.
I have figured out a slight modification of expressing the addresses
in the data page referenced by those LDR instructions so that the
assembler doesn't produce any relocs and so the linker cannot
cause any problems.

* Trim file type bits from mode header

* Define and use ValidUnixFileModes

* Rev System.Formats.Tar.TestData version

* Move ValidUnixFileModes to shared helpers

Adding [DebuggerStepThrough] to these constructors allows debuggers to
avoid stepping into them and stopping regardless of Just My Code
settings. This is desirable for debuggers as there is little benefit to
stopping in these constructors as they are primarily infrastructure
inserted by the compiler.

* Initial fix for null reference exception

* Took away lazy and put back private constructor

* Added parent property and made handler thread safe