.NET returns the method for the last delegate of the multicast delegate.

When concurrent, we always handle evacuating blocks, without the need of a synchronous major collection.

This enables building the tests w/bitcode enabled on AppleTV (and they
were already excluded from the results anyway).

Part of the fix for
https://bugzilla.xamarin.com/show_bug.cgi?id=36569

We only use the net_4_x profile now so those csproj's don't make sense anymore.

[mscorlib][System] Use PlatformNotSupportedException instead of NotSupportedException when it makes sense.

[corlib] Re-introduce Thread.Abort/Suspend/Resume, but make them throw NotSupportedException instead.

Re-introduce Thread.Abort/Suspend/Resume so that we don't have to
create separate PCL profiles.

Instead make them throw a NotSupportedException, and add an
[Obsolete (error: true)] attribute so that these methods can't
be used from source.

[corlib] Update long/short timepatterns. Reference source DateTimeInfo uses different logic for single pattern extraction. Fixes part of #36003

In tests replace usages of Thread.Abort with Thread.Interrupt when it looks
like it can work, otherwise just disable the complete test.

[runtime] Fix Thread.CurrentThread in non-root appdomains by setting the tls slot in start_wrapper, otherwise Thread.CurrentThread would create a new Thread object so there would be two. Fixes #35828.

Context: https://bugzilla.xamarin.com/show_bug.cgi?id=31432

In a few android devices TimeZoneInfo.ParseTZBuffer was failing ito
parse Europe/Moscow with:
at System.ThrowHelper.ThrowKeyNotFoundException ()
at System.Collections.Generic.Dictionary`2[System.Int32,System.String].get_Item (Int32 key)mscorlib/system/collections/generic/dictionary.cs:176
at System.TimeZoneInfo.ParseTimesTypes (System.Byte[] buffer, Int32 index, Int32 count, System.Collections.Generic.Dictionary`2 abbreviations) [0x0002f] in mcs/class/corlib/System/TimeZoneInfo.cs:1293
at System.TimeZoneInfo.ParseTZBuffer (System.String id, System.Byte[] buffer, Int32 length)

It was failing while getting the third index [3] from] from abbrevs.

abbrevs added values were the following:
[0, MMT]
[1, MT]
[2, T]
[4, MST]
[5, ST]
[6, T]
[8, MDST]
[9, DST]
[10, ST]
[11, T]
[13, S]
[15, M]
[17, MSK]
[18, SK]
[19, K]
[21, EET]
[22, ET]
[23, T]
[25, MSD]
[26, SD]
[27, D]
[29, EEST]
[30, EST]
[31, ST]
[32, T]

Index 3 was not added because its values is an empty string, as indexes
with empty values are used in this case we are now adding them to the
abbrevs dictionary.

Fixes #31432

Context: https://bugzilla.xamarin.com/show_bug.cgi?id=31432

Tests TimeZoneInfo.ParseTZBuffer with Europe/Moscow data that thrown
at System.ThrowHelper.ThrowKeyNotFoundException ()
at System.Collections.Generic.Dictionary`2[System.Int32,System.String].get_Item (Int32 key)mscorlib/system/collections/generic/dictionary.cs:176
at System.TimeZoneInfo.ParseTimesTypes (System.Byte[] buffer, Int32 index, Int32 count, System.Collections.Generic.Dictionary`2 abbreviations) [0x0002f] in mcs/class/corlib/System/TimeZoneInfo.cs:1293
at System.TimeZoneInfo.ParseTZBuffer (System.String id, System.Byte[] buffer, Int32 length)

When running out of handle, it's hard to know exactly why. Dumping them
will help troubleshoot handle leaks.

[#35375](https://bugzilla.xamarin.com/show_bug.cgi?id=35375)

The `Sort<TKey, TValue> (TKey [] keys, TValue [] items, IComparer<TKey> comparer)` overload in Array throwed when keys.Length != items.Length.
However, on .NET you can pass in a keys array with fewer elements than in items and it'd sort the elements in items up to that point.

Fixed our implementation by only throwing when keys.Length > items.Length.

This was revealed by the coreclr/tests/src/CoreMangLib/cti/system/array/arraysort12.exe test.
I decided to port the test into our testsuite so we catch regressions earlier.

This requires the symbol writer which is not available on Android.

In addition to fixing the runtime, fix the test suite to correctly detect this problem.

This popped up because, for some reason, those two types have hashcodes that
don't return identity on reference sources.

This makes serialization consistent with deserialization (where the InnerException is already retrieved as System.Exception explicitly).
Additionally it may allow serializers more options in serializing inner exceptions (i.e. fall back to System.Exception if the specific exception is not serializable itself).

The double.Epsilon value represent the smallest value that double is
able to represent. And that is diferent from the machine epsilon, which
is the smallest difference between two double values.

The second is equal to 2 ^ (-52), because there are 52bits to
represent the mantissa in a IEEE 754 double.

Add a new Moono_GetStackTraces method to Thread which can be used to obtain stack traces for all running threads.

1. Use the System.TypeSpec parser to parse components of the type name,
then call out to native code to apply the modifiers, as before.

2. TypeName and TypeIdentifier abstractions to hide display name / internal name strings

Update ModuleBuilder and TypeBuilder to use TypeIdentifier and TypeName
internally in all places that don't need to talk to native code.

3. Change ModuleBuilder.name_cache from Hashtable to Dictionary<TypeName, TypeBuilder>

Make sure that type names that include +,&*[]\ are properly escaped and
unescaped when displaying and parsing.

Throw ArgumentException on "Foo[," instead of ArrayIndexOutOfBoundsException.