[arm64] Use SP-offset rather than FP-offset.

src/compiler/linkage.cc

Index: src/compiler/linkage.cc
diff --git a/src/compiler/linkage.cc b/src/compiler/linkage.cc
index c3f6074fa635453b5945947e60246793f981fb26..306224bc8bec6e657eee3174ad190e2652945d1c 100644
--- a/src/compiler/linkage.cc
+++ b/src/compiler/linkage.cc
@@ -205,10 +205,8 @@ FrameOffset Linkage::GetFrameOffset(int spill_slot, Frame* frame) const {
   } else {
     // No frame. Retrieve all parameters relative to stack pointer.
     DCHECK(spill_slot < 0);  // Must be a parameter.
-    int offsetSpToFp =
-        kPointerSize * (StandardFrameConstants::kFixedSlotCountAboveFp -
-                        frame->GetTotalFrameSlotCount());
-    return FrameOffset::FromStackPointer(offset - offsetSpToFp);
+    int sp_offset = offset + (frame->GetSpToFpSlotCount() * kPointerSize);
+    return FrameOffset::FromStackPointer(sp_offset);
   }
 }