[x64] Recognize MOVSXWL.

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 dfd51a4bedfc4990778778e3b36bbc2bebb77e14..0bcdf24d6f0f236900ca9be05b9ddacfba2e082d 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -1401,6 +1401,15 @@ void Assembler::movsxbq(Register dst, const Operand& src) {
 }
 
 
+void Assembler::movsxwl(Register dst, Register src) {
+  EnsureSpace ensure_space(this);
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0xBF);
+  emit_modrm(dst, src);
+}
+
+
 void Assembler::movsxwl(Register dst, const Operand& src) {
   EnsureSpace ensure_space(this);
   emit_optional_rex_32(dst, src);