ARM64: Enable shorten-64-to-32 warning

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 5424 matching lines @@
 }
 
 
 // The number of register that CallApiFunctionAndReturn will need to save on
 // the stack. The space for these registers need to be allocated in the
 // ExitFrame before calling CallApiFunctionAndReturn.
 static const int kCallApiFunctionSpillSpace = 4;
 
 
 static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
-  return ref0.address() - ref1.address();
+  return static_cast<int>(ref0.address() - ref1.address());
 }
 
 
 // Calls an API function. Allocates HandleScope, extracts returned value
 // from handle and propagates exceptions.
 // 'stack_space' is the space to be unwound on exit (includes the call JS
 // arguments space and the additional space allocated for the fast call).
 // 'spill_offset' is the offset from the stack pointer where
 // CallApiFunctionAndReturn can spill registers.
 static void CallApiFunctionAndReturn(
@@ skipping 321 matching lines @@
                            kStackUnwindSpace, NULL, spill_offset,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64