[PATCH] D135238: [clang] adds copy-constructible type-trait builtins

[Christopher Di Bella via Phabricator via cfe-commits]

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- `__is_copy_constructible`
- `__is_nothrow_copy_constructible`
- `__is_trivially_copy_constructible`

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.

Unlike their default-constructible cousins, the copy-construcitble
traits can't be implemented using `__is_constructible`, etc., because we
can't form references to `void`, which are a fundamental part of copy
constructors.

This was originally a part of D116280 <https://reviews.llvm.org/D116280>.

Depends on D135177 <https://reviews.llvm.org/D135177>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135238

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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