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Commit dc41d791 authored by Eli Friedman's avatar Eli Friedman
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Add unused markings to suppress warnings.

trunk clang is a bit more aggressive about emitting unused-declaration
warnings, so adjust some AST code to match.  Specifically, use
LLVM_ATTRIBUTE_UNUSED for declarations which are never supposed to be
referenced, and turn references to declarations which are supposed to be
referenced into odr-uses.

llvm-svn: 190443
parent 1891f693
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