Option to truncate integers to 64 bits, part 1 (core VM changes)

runtime/platform/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 RUNTIME_PLATFORM_GLOBALS_H_
 #define RUNTIME_PLATFORM_GLOBALS_H_
 
 // __STDC_FORMAT_MACROS has to be defined before including <inttypes.h> to
 // enable platform independent printf format specifiers.
 #ifndef __STDC_FORMAT_MACROS
@@ skipping 440 matching lines @@
 const uword kUwordMax = kMaxUint32;
 #else
 const int kWordSizeLog2 = 3;
 const uword kUwordMax = kMaxUint64;
 #endif
 
 // Bit sizes.
 const int kBitsPerByte = 8;
 const int kBitsPerByteLog2 = 3;
 const int kBitsPerInt32 = kInt32Size * kBitsPerByte;
+const int kBitsPerInt64 = kInt64Size * kBitsPerByte;
 const int kBitsPerWord = kWordSize * kBitsPerByte;
 const int kBitsPerWordLog2 = kWordSizeLog2 + kBitsPerByteLog2;
 
 // System-wide named constants.
 const intptr_t KB = 1024;
 const intptr_t KBLog2 = 10;
 const intptr_t MB = KB * KB;
 const intptr_t MBLog2 = KBLog2 + KBLog2;
 const intptr_t GB = MB * KB;
 const intptr_t GBLog2 = MBLog2 + KBLog2;
@@ skipping 244 matching lines @@
 // tag in the ICData and check it when recreating the flow graph in
 // optimizing compiler. Enable it for other modes (product, release) if needed
 // for debugging.
 #if defined(DEBUG)
 #define TAG_IC_DATA
 #endif
 
 }  // namespace dart
 
 #endif  // RUNTIME_PLATFORM_GLOBALS_H_