GlobalISel: put debug info for static allocas in the MachineFunction.

The good reason to do this is that static allocas are pretty simple to handle
(especially at -O0) and avoiding tracking DBG_VALUEs throughout the pipeline
should give some kind of performance benefit.

The bad reason is that the debug pipeline is an unholy mess of implicit
contracts, where determining whether "DBG_VALUE %reg, imm" actually implies a
load or not involves the services of at least 3 soothsayers and the sacrifice
of at least one chicken.  And it still gets it wrong if the variable is at SP
directly.

llvm-svn: 297410

llvm/lib/CodeGen/MachineFunction.cpp

@@ -169,6 +169,7 @@ void MachineFunction::clear() {
   InstructionRecycler.clear(Allocator);
   OperandRecycler.clear(Allocator);
   BasicBlockRecycler.clear(Allocator);
+  VariableDbgInfos.clear();
   if (RegInfo) {
     RegInfo->~MachineRegisterInfo();
     Allocator.Deallocate(RegInfo);