In the case that we generate a fault (e.g. a tlb miss) on a microcoded instruction set curMacroStaticInst to null

This way we'll jump immediately to the handler

--HG--
extra : convert_revision : 36218d3a5c2342337e66e1229ea2219533efd41e

src/cpu/simple/base.cc

@@ -437,6 +437,7 @@ void
 BaseSimpleCPU::advancePC(Fault fault)
 {
     if (fault != NoFault) {
+        curMacroStaticInst = StaticInst::nullStaticInstPtr;
         fault->invoke(tc);
     } else {
         //If we're at the last micro op for this instruction