Convert ToBooleanStub to a HydrogenStub. Currently just using HBranch, which is still fully impleme…

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 46dcec0d8804b66d808c024b75825cb18b23c637..23ca36ae0fa4dc89ff44ca0c2cf232c6476fbe0c 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -2124,14 +2124,16 @@ void LCodeGen::EmitBranch(int left_block, int right_block, Condition cc) {
 void LCodeGen::DoBranch(LBranch* instr) {
   int true_block = chunk_->LookupDestination(instr->true_block_id());
   int false_block = chunk_->LookupDestination(instr->false_block_id());
-  CpuFeatureScope scope(masm(), SSE2);
 
   Representation r = instr->hydrogen()->value()->representation();
   if (r.IsSmiOrInteger32()) {
+    ASSERT(!info()->IsStub());
     Register reg = ToRegister(instr->value());
     __ test(reg, Operand(reg));
     EmitBranch(true_block, false_block, not_zero);
   } else if (r.IsDouble()) {
+    ASSERT(!info()->IsStub());
+    CpuFeatureScope scope(masm(), SSE2);
     XMMRegister reg = ToDoubleRegister(instr->value());
     __ xorps(xmm0, xmm0);
     __ ucomisd(reg, xmm0);
@@ -2141,9 +2143,11 @@ void LCodeGen::DoBranch(LBranch* instr) {
     Register reg = ToRegister(instr->value());
     HType type = instr->hydrogen()->value()->type();
     if (type.IsBoolean()) {
+      ASSERT(!info()->IsStub());
       __ cmp(reg, factory()->true_value());
       EmitBranch(true_block, false_block, equal);
     } else if (type.IsSmi()) {
+      ASSERT(!info()->IsStub());
       __ test(reg, Operand(reg));
       EmitBranch(true_block, false_block, not_equal);
     } else {
@@ -2227,8 +2231,15 @@ void LCodeGen::DoBranch(LBranch* instr) {
         __ cmp(FieldOperand(reg, HeapObject::kMapOffset),
                factory()->heap_number_map());
         __ j(not_equal, &not_heap_number, Label::kNear);
-        __ xorps(xmm0, xmm0);
-        __ ucomisd(xmm0, FieldOperand(reg, HeapNumber::kValueOffset));
+        if (CpuFeatures::IsSafeForSnapshot(SSE2)) {
+          CpuFeatureScope scope(masm(), SSE2);
+          __ xorps(xmm0, xmm0);
+          __ ucomisd(xmm0, FieldOperand(reg, HeapNumber::kValueOffset));
+        } else {
+          __ fldz();
+          __ fld_d(FieldOperand(reg, HeapNumber::kValueOffset));
+          __ FCmp();
+        }
         __ j(zero, false_label);
         __ jmp(true_label);
         __ bind(&not_heap_number);