[PATCH] D135239: [clang] adds copy-assignable type-trait builtins

[Christopher Di Bella via Phabricator via cfe-commits]

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- `__is_copy_assignable`
- `__is_nothrow_copy_assignable`
- `__is_trivially_copy_assignable`

This is information that the compiler already has, and should be exposed
so that the library doesn't need to reimplement the exact same
functionality.

Similarly to `__is_copy_construcitble`, etc., these traits can't be
implemented using `__is_assignable`, etc., because we can't form
references to void, which are a fundamental part of copy assignment.

Depends on D135238 <https://reviews.llvm.org/D135238>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135239

Files:
  clang/include/clang/Basic/TokenKinds.def
  clang/lib/Parse/ParseDeclCXX.cpp
  clang/lib/Parse/ParseExpr.cpp
  clang/lib/Sema/SemaExprCXX.cpp
  clang/test/SemaCXX/deprecated-builtins.cpp
  clang/test/SemaCXX/type-traits.cpp

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