Revert target arch detection.

src/globals.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 198 matching lines @@
 #endif
 
 
 // ----------------------------------------------------------------------------
 // Target architecture detection. This may be set externally. If not, detect
 // in the same way as the host architecture, that is, target the native
 // environment as presented by the compiler.
 
 #if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && \
     !V8_TARGET_ARCH_ARM && !V8_TARGET_ARCH_MIPS
-# if V8_HOST_ARCH_X64
+# if defined(_M_X64) || defined(__x86_64__)
 #  define V8_TARGET_ARCH_X64 1
-# elif V8_HOST_ARCH_IA32
+# elif defined(_M_IX86) || defined(__i386__)
 #  define V8_TARGET_ARCH_IA32 1
-# elif V8_HOST_ARCH_ARM
+# elif defined(__ARMEL__)
 #  define V8_TARGET_ARCH_ARM 1
-# elif V8_HOST_ARCH_MIPS
+# elif defined(__MIPSEL__)
 #  define V8_TARGET_ARCH_MIPS 1
 # else
 #  error Target architecture was not detected as supported by v8
 # endif
 #endif
 
 // Check for supported combinations of host and target architectures.
 #if V8_TARGET_ARCH_IA32 && !V8_HOST_ARCH_IA32
 # error Target architecture ia32 is only supported on ia32 host
 #elif V8_TARGET_ARCH_X64 && !V8_HOST_ARCH_X64
@@ skipping 320 matching lines @@
 // the backend, so both modes are represented by the kStrictMode value.
 enum StrictModeFlag {
   kNonStrictMode,
   kStrictMode
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBALS_H_