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efcb266311
`do { ... } while (false)` is standard macro etiquette for forcing
instantiations into a single statement and requiring a `;` afterwards,
making statement-like macros easier to reason about (and harder to use
incorrectly).
I'm about to modify the macros in `LexIdentifier()`. I noticed that the
`KEYWORD` macro *does* follow the rule, so I thought I'd clean up the
other macros to match (otherwise might not be worth changing, since the
benefits of this pattern are fairly irrelevant here).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230095 91177308-0d34-0410-b5e6-96231b3b80d8
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