[turbofan] Unify referencing of stack slots

src/mips64/lithium-codegen-mips64.cc

Index: src/mips64/lithium-codegen-mips64.cc
diff --git a/src/mips64/lithium-codegen-mips64.cc b/src/mips64/lithium-codegen-mips64.cc
index acbaffdadee7af7b86a2575fbbb7cfe56196618c..02d55ead49dba2e97eb9f948faec982d7d26dae6 100644
--- a/src/mips64/lithium-codegen-mips64.cc
+++ b/src/mips64/lithium-codegen-mips64.cc
@@ -635,15 +635,23 @@ void LCodeGen::AddToTranslation(LEnvironment* environment,
   }
 
   if (op->IsStackSlot()) {
+    int index = op->index();
+    if (index >= 0) {
+      index += StandardFrameConstants::kFixedFrameSize / kPointerSize;
+    }
     if (is_tagged) {
-      translation->StoreStackSlot(op->index());
+      translation->StoreStackSlot(index);
     } else if (is_uint32) {
-      translation->StoreUint32StackSlot(op->index());
+      translation->StoreUint32StackSlot(index);
     } else {
-      translation->StoreInt32StackSlot(op->index());
+      translation->StoreInt32StackSlot(index);
     }
   } else if (op->IsDoubleStackSlot()) {
-    translation->StoreDoubleStackSlot(op->index());
+    int index = op->index();
+    if (index >= 0) {
+      index += StandardFrameConstants::kFixedFrameSize / kPointerSize;
+    }
+    translation->StoreDoubleStackSlot(index);
   } else if (op->IsRegister()) {
     Register reg = ToRegister(op);
     if (is_tagged) {