Remove unused HIsNumberAndBranch instruction.

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 5584e39c5f1e93245d4f50e7c2c53be5d593d261..3c6187d9d41aaccaa95d5788f086b954caf66121 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -1947,25 +1947,6 @@ void LCodeGen::DoDebugBreak(LDebugBreak* instr) {
 }
 
 
-void LCodeGen::DoIsNumberAndBranch(LIsNumberAndBranch* instr) {
-  Representation r = instr->hydrogen()->value()->representation();
-  if (r.IsSmiOrInteger32() || r.IsDouble()) {
-    EmitBranch(instr, no_condition);
-  } else {
-    ASSERT(r.IsTagged());
-    Register reg = ToRegister(instr->value());
-    HType type = instr->hydrogen()->value()->type();
-    if (type.IsTaggedNumber()) {
-      EmitBranch(instr, no_condition);
-    }
-    __ JumpIfSmi(reg, instr->TrueLabel(chunk_));
-    __ CompareRoot(FieldOperand(reg, HeapObject::kMapOffset),
-                   Heap::kHeapNumberMapRootIndex);
-    EmitBranch(instr, equal);
-  }
-}
-
-
 void LCodeGen::DoBranch(LBranch* instr) {
   Representation r = instr->hydrogen()->value()->representation();
   if (r.IsInteger32()) {