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

src/mips/codegen-mips.cc

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 #include "v8.h"
 
-#if defined(V8_TARGET_ARCH_MIPS)
+#if V8_TARGET_ARCH_MIPS
 
 #include "codegen.h"
 #include "macro-assembler.h"
 #include "simulator-mips.h"
 
 namespace v8 {
 namespace internal {
 
 
 UnaryMathFunction CreateTranscendentalFunction(TranscendentalCache::Type type) {
@@ skipping 616 matching lines @@
     patcher.masm()->dd(reinterpret_cast<uint32_t>(stub->instruction_start()));
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS