Fix context register allocation in LTransitionElementsKind.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index eb1f960c0a738d48595287a90429882c4ea9faaa..739f042cb84df04fc96865d78167adac2bdf9a78 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -4845,13 +4845,10 @@ void LCodeGen::DoTransitionElementsKind(LTransitionElementsKind* instr) {
                          ToRegister(instr->temp()),
                          kDontSaveFPRegs);
   } else {
+    ASSERT(ToRegister(instr->context()).is(esi));
     PushSafepointRegistersScope scope(this);
     if (!object_reg.is(eax)) {
-      __ push(object_reg);
-    }
-    LoadContextFromDeferred(instr->context());
-    if (!object_reg.is(eax)) {
-      __ pop(eax);
+      __ mov(eax, object_reg);
     }
     __ mov(ebx, to_map);
     TransitionElementsKindStub stub(from_kind, to_kind);