[PATCH] Enhance loop rotation with existence of profile data in MachineBlockPlacement pass.

[Cong Hou]

Bug fix for checking if a function has profile data (from using hasMetadata() to getEntryCount()).


http://reviews.llvm.org/D10717

Files:
  lib/CodeGen/MachineBlockPlacement.cpp
  test/CodeGen/X86/code_placement_loop_rotation.ll

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