[arm] Make CEntryStub's handling of triple return values more robust.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index fb46362d41c367aaafc40e548e82859eace0a35c..0224f9d4939a69535669e704ce5d9029f6e082ac 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -1055,9 +1055,9 @@ void CEntryStub::Generate(MacroAssembler* masm) {
   if (result_size() > 2) {
     DCHECK_EQ(3, result_size());
     // Read result values stored on stack.
-    __ ldr(r2, MemOperand(r0, 2 * kPointerSize));
-    __ ldr(r1, MemOperand(r0, 1 * kPointerSize));
-    __ ldr(r0, MemOperand(r0, 0 * kPointerSize));
+    __ ldr(r2, MemOperand(sp, 2 * kPointerSize));
+    __ ldr(r1, MemOperand(sp, 1 * kPointerSize));
+    __ ldr(r0, MemOperand(sp, 0 * kPointerSize));
   }
   // Result returned in r0, r1:r0 or r2:r1:r0 - do not destroy these registers!