…ocations` (#117985)

* Re-enable.

* Indent.

* Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Larry Ewing <lewing@microsoft.com>

`MethodNameAndSignature` no longer has the `string`-typed property.

…ct nodes (#118154)

Removes the IL2109 warning about a type without RUC derived from a type with
RUC. This existed for RequiresUnreferencedCode but not RequiresDynamicCode.
The warning on the class should not be necessary because there will be a warning
for the base ctor call.

Addresses some of the regressions in #116486. If a loop has bounds checks in it, it might benefit from cloning, so perhaps we ought to tolerate going a bit over the inversion size limit to enable downstream optimizations. I ought to do something for GDV checks; perhaps as a follow-up, I'll move the checks in loop cloning to something I can reuse here. The 1.25x figure isn't all that scientific -- I found it to be the smallest factor necessary to make a dent in the regressions from less cloning I looked at, and despite the size increases, it's a net PerfScore win across collections.

This lets the logic from the ILLink targets add
`AssemblyMetadata("IsTrimmable", "true")` to ref projects which have
trimming enabled.

Also moves the trimming opt-out into `Directory.Build.props` when it
should be shared between src and corresponding ref projects.

This will be used to enable the Roslyn analyzer to produce a warning
for references to assemblies that aren't marked "IsTrimmable".

* Enable lookarounds to influence atomicity

As part of our auto-atomicity handling, today we give up when the subsequent node is a lookaround. This improves it to support the case when the subsequent node is a positive lookahead.

* Update src/libraries/System.Text.RegularExpressions/tests/UnitTests/RegexReductionTests.cs

* Replace DataTable with PinnedVector class
* Add functions for generating random Vectors
* Add functions for converting between Vector and Array types
* Generate an expected Vector for comparison and log to terminal
* Simplify validation functions
* Remove RetVectorType and Op1VectorType template variables

…all (#117727)

* When encountering a must expand intrinsic self-call in an interpreted method, always expand it even if intrinsics are turned off.
* Clean up a minor edge case in the 'is reference or contains references' intrinsic
* Remove an alignment assert that is causing failures in the startup path