[PATCH] D100930: [Clang] Add clang attribute `clang_builtin_alias`.

[Hsiangkai Wang via Phabricator via cfe-commits]

HsiangKai created this revision.
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In some cases, we want to provide the alias name for the clang builtins.
For example, the arguments must be constant integers for some RISC-V builtins.
If we use wrapper functions, we could not constrain the arguments be constant
integer. This attribute is used to achieve the purpose.

Besides this, use `clang_builtin_alias` is more efficient than using
wrapper functions. We use this attribute to deal with test time issue
reported in https://bugs.llvm.org/show_bug.cgi?id=49962.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D100930

Files:
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/AST/Decl.cpp
  clang/lib/Sema/SemaDeclAttr.cpp
  clang/test/CodeGen/RISCV/riscv-attr-builtin-alias-err.c
  clang/test/CodeGen/RISCV/riscv-attr-builtin-alias.c
  clang/test/Misc/pragma-attribute-supported-attributes-list.test
  clang/utils/TableGen/RISCVVEmitter.cpp

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