[PATCH] [AArch64] Fix crash with empty/pseudo-only blocks in A53 erratum (835769) workaround

[Bradley Smith]

This patch fixes a bug in the A53 erratum (835769) workaround, whereby the backend would assert if this phase was given an empty block or a pseudo only block (thought to not exist this late in codegen).

http://reviews.llvm.org/D5771

Files:
  lib/Target/AArch64/AArch64A53Fix835769.cpp
  test/CodeGen/AArch64/aarch64-fix-cortex-a53-835769.ll
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