[PATCH] LivePhysRegs: Add support to add pristine registers when populating with live-in/live-out registers.

[Matthias Braun]

REPOSITORY
  rL LLVM

================
Comment at: lib/CodeGen/LivePhysRegs.cpp:140
@@ +139,3 @@
+  const MachineFrameInfo &MFI = *MF.getFrameInfo();
+  if (!MFI.isCalleeSavedInfoValid())
+    return;
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qcolombet wrote:
> Is there a reason we are not using MachineFrameInfo::getPristineRegs?
> 
> I may be wrong, but at first glance it seems as if we copied/pasted the code from there.
This is mostly because the existing API is clunky: getPristineRegs() returns a BitVector by value(!) and has to compute an additional intermediate bitvector which we can avoid here by clearing and setting the registers directly in the LivePhysRegs.

http://reviews.llvm.org/D10139

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