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

[Peter Collingbourne]

- Add test from PR19582


http://reviews.llvm.org/D8586

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

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