X87: CTZ instruction implemented as optional operator.

src/x87/macro-assembler-x87.h

Index: src/x87/macro-assembler-x87.h
diff --git a/src/x87/macro-assembler-x87.h b/src/x87/macro-assembler-x87.h
index 9279b13248e045d97351148160854d2599383bae..ecbb4f59c64530b4a72cf2ed48faffbd694f00d3 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -809,6 +809,9 @@ class MacroAssembler: public Assembler {
   void Lzcnt(Register dst, Register src) { Lzcnt(dst, Operand(src)); }
   void Lzcnt(Register dst, const Operand& src);
 
+  void Tzcnt(Register dst, Register src) { Tzcnt(dst, Operand(src)); }
+  void Tzcnt(Register dst, const Operand& src);
+
   // Emit call to the code we are currently generating.
   void CallSelf() {
     Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location()));