[turbofan] Introduces the SpeculativeNumberShiftLeft opcode.

test/mjsunit/compiler/turbo-number-feedback.js

Index: test/mjsunit/compiler/turbo-number-feedback.js
diff --git a/test/mjsunit/compiler/turbo-number-feedback.js b/test/mjsunit/compiler/turbo-number-feedback.js
index 059a0ca03151e158e76b155261a8bc1ced354ac4..896d1542424bf9cb727306070fc2fffd3a08983a 100644
--- a/test/mjsunit/compiler/turbo-number-feedback.js
+++ b/test/mjsunit/compiler/turbo-number-feedback.js
@@ -56,3 +56,14 @@
   assertEquals(1, f3(0, 1));
   assertEquals(1.5, f3(1, 1));
 })();
+
+(function ShiftLeftSmis() {
+  function f4(a, b) {
+    return a << b;
+  }
+
+  assertEquals(24, f4(3, 3));
+  assertEquals(40, f4(5, 3));
+  %OptimizeFunctionOnNextCall(f4);
+  assertEquals(64, f4(4, 4));
+})();