[PATCH] Make MCAsmParserSemaCallback::LookupInlineAsmLabel a pure virtual function

[Ehsan Akhgari]

Hi rnk,

r218229 made this function return a dummy nullptr in order to avoid
API breakage between clang/llvm.

http://reviews.llvm.org/D5432

Files:
  include/llvm/MC/MCParser/MCAsmParser.h
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