Thumb2 Backend: Use sp-relative offsets for stack slot operations in Crankshaft

src/lithium.cc

Index: src/lithium.cc
diff --git a/src/lithium.cc b/src/lithium.cc
index 5b3a30332c6d88d609206e0ba3c78927399964c4..196188bbcacd1e3bda52a7093d796b24804facad 100644
--- a/src/lithium.cc
+++ b/src/lithium.cc
@@ -263,14 +263,16 @@ int ElementsKindToShiftSize(ElementsKind elements_kind) {
 }
 
 
-int StackSlotOffset(int index) {
+int StackSlotOffset(int index, int fp_sp_delta) {
+  ASSERT(fp_sp_delta > 0);
   if (index >= 0) {
     // Local or spill slot. Skip the frame pointer, function, and
     // context in the fixed part of the frame.
-    return -(index + 3) * kPointerSize;
+    return -(index + 3) * kPointerSize + fp_sp_delta;
   } else {
     // Incoming parameter. Skip the return address.
-    return -(index + 1) * kPointerSize + kFPOnStackSize + kPCOnStackSize;
+    return -(index + 1) * kPointerSize + kFPOnStackSize +
+        kPCOnStackSize + fp_sp_delta;
   }
 }