[PATCH] MIR Lexer: adopt the 'maybeLex...' pattern.

[Alex Lorenz]

Hi silvas,

This patch refactors the MI lexer so that the lexing functions use the 'maybeLex...' pattern, where the lexing functions determine if they can lex the current token by themselves.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10817

Files:
  lib/CodeGen/MIRParser/MILexer.cpp

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