[cfe-dev] Hitting LexIdentifier with a minor performance hit

[Sean Hunt]

Hey,

I'd like to split LexIdentifier into two functions so that the actual 
identifier lexing logic can be reused for user-defined literal suffixes. 
Since this is a change to the lexing code that will probably have a 
negative performance impact, however slight (one function call of 
overhead per identifier is added; one goto is removed per "nasty" 
identifier (a \, $, or ? is present)), I wanted to check it by first.

The effective change is that the literal lexing code will be able to use 
LexIdentifierInternal to parse the suffix when I add that in.

Sean
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