[PATCH] Make global aliases have symbol size equal to their type

[John Brawn]

Hi rafael, ab, t.p.northover,

This is mainly for the benefit of GlobalMerge, so that an alias into a MergedGlobals variable has the same size as the original non-merged variable.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10837

Files:
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  test/CodeGen/AArch64/global-merge-2.ll
  test/CodeGen/AArch64/global-merge-3.ll
  test/CodeGen/ARM/aliases.ll

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