Now that the X86 Maximal Stack Alignment Check pass has been removed …

…(i.e.,

r168627), we no longer need to call the freezeReservedRegs() function a second
time.  Previously, this pass was conservatively adding the FP to the set of
reserved registers, requiring the second update to the reserved registers.
rdar://12719844

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168630 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/RegAllocBase.cpp

@@ -58,7 +58,6 @@ void RegAllocBase::init(VirtRegMap &vrm,
   VRM = &vrm;
   LIS = &lis;
   Matrix = &mat;
-  MRI->freezeReservedRegs(vrm.getMachineFunction());
   RegClassInfo.runOnMachineFunction(vrm.getMachineFunction());
 }