X87: [turbofan] Turn Math.clz32 into an inlinable builtin.

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 061709be9c050efb6ff5578ad47b22bc4d58b56b..e801bf52f80958c2d9982d3984c1fb59f57a769f 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -776,6 +776,9 @@ class MacroAssembler: public Assembler {
   void Push(Register src) { push(src); }
   void Pop(Register dst) { pop(dst); }
 
+  void Lzcnt(Register dst, Register src) { Lzcnt(dst, Operand(src)); }
+  void Lzcnt(Register dst, const Operand& src);
+
   // Emit call to the code we are currently generating.
   void CallSelf() {
     Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location()));