[PATCH] D23035: [Support] Add LLVM_BITFIELD_WIDTH and LLVM_CHECKED_BITFIELD_ASSIGN macros.

[Justin Lebar via llvm-commits]

jlebar created this revision.
jlebar added a reviewer: chandlerc.
jlebar added subscribers: llvm-commits, majnemer, timshen.

The latter lets us assign to a bitfield while also checking that the RHS
fits into the field.

There are many places where we check that the RHS "fits" before
assigning it to a bitfield; this lets us replace those with a single
line (which also correctly infers the size of the LHS).

https://reviews.llvm.org/D23035

Files:
  llvm/include/llvm/Support/Bitfields.h
  llvm/unittests/Support/BitfieldsTest.cpp
  llvm/unittests/Support/CMakeLists.txt

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