[Local GC] Ensure that handle creation returns null on failure instead of throwing...

[Local GC] Ensure that handle creation returns null on failure instead of throwing (dotnet/coreclr#11092)

* [Local GC] Ensure that handle creation returns null on failure instead of throwing

* Fix some clang pedantry about jumping past variable initialization

* Throw OOM if initialization of handle store fails

* Perform the handle OOM check in each handle helper

Commit migrated from https://github.com/dotnet/coreclr/commit/69d43a0f8cfe095336b286e7bb892fe49c702e30