[PATCH] MC: For variable symbols, maintain MCSymbol::Section as a cache.

[Peter Collingbourne]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8798

Files:
  llvm/trunk/include/llvm/MC/MCMachObjectWriter.h
  llvm/trunk/include/llvm/MC/MCSymbol.h
  llvm/trunk/lib/MC/MCExpr.cpp
  llvm/trunk/lib/MC/MCSymbol.cpp
  llvm/trunk/lib/MC/MachObjectWriter.cpp
  llvm/trunk/lib/Target/X86/X86AsmPrinter.cpp
  llvm/trunk/test/MC/ELF/alias.s
  llvm/trunk/test/MC/ELF/pr19582.s
  llvm/trunk/test/MC/MachO/ARM/aliased-symbols.s

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