[clang] [clang-tools-extra] [Clang] Make the SizeType, SignedSizeType and PtrdiffType be named sugar types instead of built-in types (PR #143653)

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YexuanXiao wrote:

CI shows that it passed all tests on Linux, but there were 4 tests failed on Windows, which seem unrelated to this PR.

https://github.com/llvm/llvm-project/pull/143653