Add righ shift test for corner cases, use macro for deopt reasons (all suggested by Slava in a prev…

tests/language/bit_operations_test.dart

Index: tests/language/bit_operations_test.dart
===================================================================
--- tests/language/bit_operations_test.dart	(revision 8451)
+++ tests/language/bit_operations_test.dart	(working copy)
@@ -54,8 +54,22 @@
     TestPositiveValueShifts();
     TestNoMaskingOfShiftCount();
     TestNegativeCountShifts();
+    for (int i = 0; i < 1000; i++) {
+      TestCornerCasesLeftShifts();
+    }
   }
   
+  static void TestCornerCasesLeftShifts() {
+    var v32 = 0xFF000000;
+    var v64 = 0xFF00000000000000;
+    Expect.equals(0x3, v32 >> 0x1E);
+    Expect.equals(0x1, v32 >> 0x1F);
+    Expect.equals(0x0, v32 >> 0x20);
+    Expect.equals(0x3, v64 >> 0x3E);
+    Expect.equals(0x1, v64 >> 0x3F);
+    Expect.equals(0x0, v64 >> 0x40);
+  }
+  
   static void TestNegativeCountShifts() {
     bool throwOnLeft(a, b) {
       try {