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Commit d8aee0e8 authored by Chris Lattner's avatar Chris Lattner
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Implement "lparen scanning" for lexer buffers, by making "skipping lexing" 

completely reversible.  This implements tests 3/4 of
test/Preprocessor/macro_fn_lparen_scan.c

llvm-svn: 38699
parent b63d9de2
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