Improve our simple elimination of hole checks.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
===================================================================
--- src/ia32/lithium-codegen-ia32.cc	(revision 9445)
+++ src/ia32/lithium-codegen-ia32.cc	(working copy)
@@ -2073,7 +2073,7 @@
 void LCodeGen::DoLoadGlobalCell(LLoadGlobalCell* instr) {
   Register result = ToRegister(instr->result());
   __ mov(result, Operand::Cell(instr->hydrogen()->cell()));
-  if (instr->hydrogen()->check_hole_value()) {
+  if (instr->hydrogen()->RequiresHoleCheck()) {
     __ cmp(result, factory()->the_hole_value());
     DeoptimizeIf(equal, instr->environment());
   }
@@ -2107,7 +2107,7 @@
   // been deleted from the property dictionary. In that case, we need
   // to update the property details in the property dictionary to mark
   // it as no longer deleted. We deoptimize in that case.
-  if (instr->hydrogen()->check_hole_value()) {
+  if (instr->hydrogen()->RequiresHoleCheck()) {
     __ cmp(FieldOperand(object, offset), factory()->the_hole_value());
     DeoptimizeIf(equal, instr->environment());
   }
@@ -2369,16 +2369,14 @@
     LLoadKeyedFastDoubleElement* instr) {
   XMMRegister result = ToDoubleRegister(instr->result());
 
-  if (instr->hydrogen()->RequiresHoleCheck()) {
-    int offset = FixedDoubleArray::kHeaderSize - kHeapObjectTag +
-        sizeof(kHoleNanLower32);
-    Operand hole_check_operand = BuildFastArrayOperand(
-        instr->elements(), instr->key(),
-        FAST_DOUBLE_ELEMENTS,
-        offset);
-    __ cmp(hole_check_operand, Immediate(kHoleNanUpper32));
-    DeoptimizeIf(equal, instr->environment());
-  }
+  int offset = FixedDoubleArray::kHeaderSize - kHeapObjectTag +
+      sizeof(kHoleNanLower32);
+  Operand hole_check_operand = BuildFastArrayOperand(
+      instr->elements(), instr->key(),
+      FAST_DOUBLE_ELEMENTS,
+      offset);
+  __ cmp(hole_check_operand, Immediate(kHoleNanUpper32));
+  DeoptimizeIf(equal, instr->environment());
 
   Operand double_load_operand = BuildFastArrayOperand(
       instr->elements(), instr->key(), FAST_DOUBLE_ELEMENTS,