Bug 937540 part 1 - Add |operator new| for placement new to TempObject and use for regalloc objects. r=luke
Bug 937540 part 2 - Use placement new for BitSet and LoopAliasInfo. r=sstangl
Bug 937540 part 3 - Use placement new for GVN ValueNumberData. r=mjrosenb
Bug 937540 part 4 - Use placement new for MBasicBlock. r=djvj