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

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index 1eb054772356d76e87092a3a0f3fda0ca3ed927b..abdf7a5d9c9fac54006a24e2cec39efc4e7d55b5 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -742,6 +742,15 @@ void Assembler::bsrl(Register dst, Register src) {
 }
 
 
+void Assembler::bsrl(Register dst, const Operand& src) {
+  EnsureSpace ensure_space(this);
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0xBD);
+  emit_operand(dst, src);
+}
+
+
 void Assembler::call(Label* L) {
   positions_recorder()->WriteRecordedPositions();
   EnsureSpace ensure_space(this);