Clean up the usage of V8_TARGET_ARCH_${arch} and V8_HOST_ARCH_${arch}

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 1290 matching lines @@
   return ExternalReference(
       reinterpret_cast<void*>(&double_constants.the_hole_nan));
 }
 
 
 #ifndef V8_INTERPRETED_REGEXP
 
 ExternalReference ExternalReference::re_check_stack_guard_state(
     Isolate* isolate) {
   Address function;
-#ifdef V8_TARGET_ARCH_X64
+#if V8_TARGET_ARCH_X64
   function = FUNCTION_ADDR(RegExpMacroAssemblerX64::CheckStackGuardState);
 #elif V8_TARGET_ARCH_IA32
   function = FUNCTION_ADDR(RegExpMacroAssemblerIA32::CheckStackGuardState);
 #elif V8_TARGET_ARCH_ARM
   function = FUNCTION_ADDR(RegExpMacroAssemblerARM::CheckStackGuardState);
 #elif V8_TARGET_ARCH_MIPS
   function = FUNCTION_ADDR(RegExpMacroAssemblerMIPS::CheckStackGuardState);
 #else
   UNREACHABLE();
 #endif
@@ skipping 340 matching lines @@
     assembler_->RecordRelocInfo(RelocInfo::POSITION, state_.current_position);
     state_.written_position = state_.current_position;
     written = true;
   }
 
   // Return whether something was written.
   return written;
 }
 
 } }  // namespace v8::internal