Pool-allocation for MachineInstrs, MachineBasicBlocks, and

MachineMemOperands. The pools are owned by MachineFunctions.

This drastically reduces the number of calls to malloc/free made
during the "Emit" phase of scheduling, as well as later phases
in CodeGen. Combined with other changes, this speeds up the
"instruction selection" phase of CodeGen by 10% in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53212 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/PHIElimination.cpp

@@ -354,7 +354,7 @@ void PNE::LowerAtomicPHINode(MachineBasicBlock &MBB,
   }
     
   // Really delete the PHI instruction now!
-  delete MPhi;
+  MF.DeleteMachineInstr(MPhi);
   ++NumAtomic;
 }