[PP-EXT] Refactoring, part 1

[PP-EXT] Refactoring, part 1

[PP-EXT] Refactoring, part 1

[PP-EXT] Enhance typedefs usage. Fix warning for default nultimethod

[PP-EXT] Support typedefs for specializations

[PP-EXT] Add test pp-mm-default-eq0-perimeter.c

[PP-EXT] Add pp-mm-default-eq0.c to check_all.py

[PP-EXT] fix clang version in check_all.py

[PP-EXT] Add pp-shared-main to check_all.py

[PP-EXT] Support to extend generalization from shared libs

[PP-EXT] Fix build after rebase on top of 21.1.8

Fix Assertion failures in tests

[Github] Remove use of setup-windows and install-ninja in llvm tests

[Github] Remove install-ninja/setup-windows

[ExtractAPI] Format typedef params correctly (#171516)

[compiler-rt][sanitizer] fix i386 build for Haiku (#171075)

[SelectOptimize] Fix incorrect -1 immediate for large integers (#170860)

[PP-EXT] fix clang version in check_all.py

[PP-EXT] Add pp-shared-main to check_all.py

[PP-EXT] Support to extend generalization from shared libs

[PP-EXT] Fix build after rebase on top of 21.1.8

[PP-EXT] Fix build after rebase on top of 21.1.8