Use RemovedSlots to decide whether to run remapInstructions

Author: mohammed-nurulhoque

llvm/lib/CodeGen/StackColoring.cpp

@@ -1355,7 +1355,7 @@ bool StackColoring::runOnMachineFunction(MachineFunction &Func) {
 
   // Scan the entire function and update all machine operands that use frame
   // indices to use the remapped frame index.
-  if (!SlotRemap.empty()) {
+  if (RemovedSlots > 0) {
     expungeSlotMap(SlotRemap, NumSlots);
     remapInstructions(SlotRemap);
   }

llvm/test/CodeGen/X86/StackColoring-tbaa.mir

@@ -53,7 +53,7 @@ body:             |
     ; CHECK: [[LEA64r:%[0-9]+]]:gr64 = nuw LEA64r %stack.1.agg, 1, $noreg, 24, $noreg
     ; CHECK-NEXT: CMP8mi %stack.1.agg, 1, $noreg, 47, $noreg, 0, implicit-def $eflags :: (dereferenceable load (s8) from %ir.a22, !tbaa !2)
     ; CHECK-NEXT: [[CMOV64rm:%[0-9]+]]:gr64 = CMOV64rm [[LEA64r]], %stack.1.agg, 1, $noreg, 24, $noreg, 8, implicit $eflags :: (dereferenceable load (s64) from %ir.a2)
-    ; CHECK-NEXT: [[MOV8rm:%[0-9]+]]:gr8 = MOV8rm killed [[CMOV64rm]], 1, $noreg, 16, $noreg :: (load (s8) from %ir.add.ptr.i, !tbaa !2)
+    ; CHECK-NEXT: [[MOV8rm:%[0-9]+]]:gr8 = MOV8rm killed [[CMOV64rm]], 1, $noreg, 16, $noreg :: (load (s8) from %ir.add.ptr.i)
     ; CHECK-NEXT: $al = COPY [[MOV8rm]]
     ; CHECK-NEXT: RET 0, $al
     LIFETIME_START %stack.0.padding