VM: Make more globals constant where easily possible.

runtime/vm/globals.h

 // Copyright (c) 2012, 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.
 
 #ifndef VM_GLOBALS_H_
 #define VM_GLOBALS_H_
 
 // This file contains global definitions for the VM library only. Anything that
 // is more globally useful should be added to 'vm/globals.h'.
 
 #include "platform/globals.h"
 
 #if defined(_WIN32)
 // Undef conflicting defines.
 #undef PARITY_EVEN
 #undef PARITY_ODD
 #undef near
 #endif
 
 // The following #defines are invalidated.
 #undef OVERFLOW  // From math.h conflicts in constants_ia32.h
 
 namespace dart {
 // Smi value range is from -(2^N) to (2^N)-1.
 // N=30 (32-bit build) or N=62 (64-bit build).
 const intptr_t kSmiBits = kBitsPerWord - 2;
 const intptr_t kSmiMax = (static_cast<intptr_t>(1) << kSmiBits) - 1;
 const intptr_t kSmiMin =  -(static_cast<intptr_t>(1) << kSmiBits);
 
-const double kPosInfinity = bit_cast<double>(DART_UINT64_C(0x7ff0000000000000));
-const double kNegInfinity = bit_cast<double>(DART_UINT64_C(0xfff0000000000000));
+#define kPosInfinity bit_cast<double>(DART_UINT64_C(0x7ff0000000000000))
+#define kNegInfinity bit_cast<double>(DART_UINT64_C(0xfff0000000000000))
 
 // The expression ARRAY_SIZE(array) is a compile-time constant of type
 // size_t which represents the number of elements of the given
 // array. You should only use ARRAY_SIZE on statically allocated
 // arrays.
 #define ARRAY_SIZE(array)                                       \
   ((sizeof(array) / sizeof(*(array))) /                         \
   static_cast<intptr_t>(!(sizeof(array) % sizeof(*(array)))))
 
 
@@ skipping 79 matching lines @@
 #else
 #error Unknown host architecture.
 #endif
 
 
 #endif  // !defined(TARGET_OS_WINDOWS))
 
 }  // namespace dart
 
 #endif  // VM_GLOBALS_H_