Revert "VM: New calling convention for generated code."

runtime/vm/stack_frame_mips.h

Index: runtime/vm/stack_frame_mips.h
diff --git a/runtime/vm/stack_frame_mips.h b/runtime/vm/stack_frame_mips.h
index 75869af3ca7a2255a281a6735c4e91cf6df9a94d..142ed613c6720e0c812ec53a48878ec20b48c75b 100644
--- a/runtime/vm/stack_frame_mips.h
+++ b/runtime/vm/stack_frame_mips.h
@@ -17,9 +17,9 @@ Callee frame   | ...                |
 Current frame  | ...               T| <- SP of current frame
                | first local       T|
                | caller's PP       T|
-               | CODE_REG          T|    (current frame's code object)
                | caller's FP        | <- FP of current frame
                | caller's RA        |    (PC of caller frame)
+               | PC marker          |    (current frame's code entry + offset)
                +--------------------+
 Caller frame   | last parameter     | <- SP of caller frame
                |  ...               |
@@ -28,17 +28,17 @@ Caller frame   | last parameter     | <- SP of caller frame
 */
 
 static const int kDartFrameFixedSize = 4;  // PP, FP, RA, PC marker.
-static const int kSavedPcSlotFromSp = -1;
+static const int kSavedPcSlotFromSp = -2;
 
 static const int kFirstObjectSlotFromFp = -1;  // Used by GC to traverse stack.
 
-static const int kFirstLocalSlotFromFp = -3;
-static const int kSavedCallerPpSlotFromFp = -2;
-static const int kPcMarkerSlotFromFp = -1;
+static const int kFirstLocalSlotFromFp = -2;
+static const int kSavedCallerPpSlotFromFp = -1;
 static const int kSavedCallerFpSlotFromFp = 0;
 static const int kSavedCallerPcSlotFromFp = 1;
-static const int kParamEndSlotFromFp = 1;  // One slot past last parameter.
-static const int kCallerSpSlotFromFp = 2;
+static const int kPcMarkerSlotFromFp = 2;
+static const int kParamEndSlotFromFp = 2;  // One slot past last parameter.
+static const int kCallerSpSlotFromFp = 3;
 
 // Entry and exit frame layout.
 static const int kExitLinkSlotFromEntryFp = -23;