[xbuild]: Support <PropertyGroup/ItemGroup> inside <Target>.
Fix support for custom attribute classes in CustomAttributeDataMirror which indirectly inherit from Attribute. Fixes #11564.
Fix the windows build.
Implement the calculation of stack bounds on windows. Fixes #11624.
Implement partial generic methods
NaCl runtime fixes

- fix compile/runtime issues caused by upstream changes
- add NaCl glibc support
- various changes to support running tests in NaCl glibc
  from 'make check'
NaCl ARM work, first pass