[PATCH] D158302: [clang] Add simple utils to ensure static assert on bit count of DeclContext

[Ding Fei via Phabricator via cfe-commits]

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Manually counting bits for DeclContext is error-prone. These two are still out-dated:

1. `NumObjCMethodDeclBits` (25, not 24)
2. `NumBlockDeclBits` (6, not 5)

Although no harm at this moment but it's still misleading and might cause problem
for the future.

Two simple reflection-like utilities `countBits` & `countFields` are added for auto-
updating these bits at compile time and static assert on syncing with any changes.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158302

Files:
  clang/include/clang/AST/DeclBase.h
  clang/include/clang/Support/BitFieldReflection.h
  clang/lib/Serialization/ASTWriterDecl.cpp

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