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
6 files changed
tree: bb85a66babc072890fa2b6784559405eabc6024f
  1. clang/
  2. llvm/
  3. stacker/