Use immediates when possible for HBoundsCheck and HLoadKeyedFastElement

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 07867c70f2fa24463e9875702bbe9a005106099e..22af79397db9b29e84e51e7251e7efe89a268c52 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1568,8 +1568,9 @@ LInstruction* LChunkBuilder::DoValueOf(HValueOf* instr) {
 
 
 LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
-  return AssignEnvironment(new LBoundsCheck(UseRegisterAtStart(instr->index()),
-                                            UseAtStart(instr->length())));
+  return AssignEnvironment(new LBoundsCheck(
+      UseRegisterOrConstantAtStart(instr->index()),
+      UseAtStart(instr->length())));
 }
 
 
@@ -1890,9 +1891,9 @@ LInstruction* LChunkBuilder::DoLoadKeyedFastElement(
   ASSERT(instr->representation().IsTagged());
   ASSERT(instr->key()->representation().IsInteger32());
   LOperand* obj = UseRegisterAtStart(instr->object());
-  LOperand* key = UseRegisterAtStart(instr->key());
+  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   LLoadKeyedFastElement* result = new LLoadKeyedFastElement(obj, key);
-  return AssignEnvironment(DefineSameAsFirst(result));
+  return AssignEnvironment(DefineAsRegister(result));
 }