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

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 14c2fefa23de261b4c4d1831ec87ffaf47a578d4..552a2df93d5faeb9bd935d1b9849d18554480f29 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -1901,14 +1901,17 @@ void LCodeGen::DoBranch(LBranch* instr) {
 
   Representation r = instr->hydrogen()->value()->representation();
   if (r.IsInteger32()) {
+    ASSERT(!info()->IsStub());
     Register reg = ToRegister(instr->value());
     __ testl(reg, reg);
     EmitBranch(true_block, false_block, not_zero);
   } else if (r.IsSmi()) {
+    ASSERT(!info()->IsStub());
     Register reg = ToRegister(instr->value());
     __ testq(reg, reg);
     EmitBranch(true_block, false_block, not_zero);
   } else if (r.IsDouble()) {
+    ASSERT(!info()->IsStub());
     XMMRegister reg = ToDoubleRegister(instr->value());
     __ xorps(xmm0, xmm0);
     __ ucomisd(reg, xmm0);
@@ -1918,9 +1921,11 @@ void LCodeGen::DoBranch(LBranch* instr) {
     Register reg = ToRegister(instr->value());
     HType type = instr->hydrogen()->value()->type();
     if (type.IsBoolean()) {
+      ASSERT(!info()->IsStub());
       __ CompareRoot(reg, Heap::kTrueValueRootIndex);
       EmitBranch(true_block, false_block, equal);
     } else if (type.IsSmi()) {
+      ASSERT(!info()->IsStub());
       __ SmiCompare(reg, Smi::FromInt(0));
       EmitBranch(true_block, false_block, not_equal);
     } else {