Use inlined double temporary object for unary operation, add tests. Fix disassembler crash.

tests/standalone/src/DeoptimizationTest.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Test deoptimization.
 
 class SmiCompares {
   // Test deoptimization when one argument is known to be Smi.
   static bool smiCompareLessThan2(a) {
     return a < 2;
   }
@@ skipping 164 matching lines @@
       var r = ShiftRight(10, 2);
       Expect.equals(2, r);
     }
     // ShiftRight is optimized.
     Expect.equals(0, ShiftRight(10, 64));
     // Deoptimize ShiftRight because 'a' is a Mint.
     var mint = 1 << 63;
     Expect.equals(1 << 3, ShiftRight(mint, 60));
   }
 
+  static doubleUnary() {
+    num unary(num a) { return -a; }
+
+    for (int i = 0; i < 2000; i++) {
+      var r = unary(2.0);
+      Expect.equals(-2.0, r);
+    }
+    var r = unary(5);
+    Expect.equals(-5, r);
+  }
+
   static void testMain() {
     test1();
     test2();
     test3();
     test4();
     SmiCompares.smiComparesTest();
     SmiBinop.smiBinopTest();
     SmiBinop.smiBinopOverflowTest();
     ObjectsEquality.objectsEqualityTest();
     smiRightShift();
+    doubleUnary();
   }
 }
 
 main() {
   DeoptimizationTest.testMain();
 }