Disambiguate Numbers and Identifiers

Use lookahead to determine whether a number is really a number or is
part of something forming an identifier.  This won't come into play
until the paste operator is recognized as a unique token.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142513 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed