[arm64] Don't try convert binary operation to shifted form when both operands are the same.

test/mjsunit/regress/regress-crbug-523307.js

Index: test/mjsunit/regress/regress-crbug-523307.js
diff --git a/test/mjsunit/regress/regress-filter-contexts.js b/test/mjsunit/regress/regress-crbug-523307.js
similarity index 72%
copy from test/mjsunit/regress/regress-filter-contexts.js
copy to test/mjsunit/regress/regress-crbug-523307.js
index d2abe0032548428324afd6675a7031bf53a5e56e..f2909675b2424c68c83fcf0b0f891467fcce851c 100644
--- a/test/mjsunit/regress/regress-filter-contexts.js
+++ b/test/mjsunit/regress/regress-crbug-523307.js
@@ -4,11 +4,13 @@
 
 // Flags: --allow-natives-syntax
 
-function f() { return f.x; }
-f.__proto__ = null;
-f.prototype = "";
+function f(x) {
+  var c = x * x << 366;
+  var a = c + c;
+  return a;
+}
 
-f();
-f();
+f(1);
+f(1);
 %OptimizeFunctionOnNextCall(f);
-f();
+f(1);