First draft of the sh4 port

src/sh4/lithium-sh4.h

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-#ifndef V8_ARM_LITHIUM_ARM_H_
-#define V8_ARM_LITHIUM_ARM_H_
+#ifndef V8_SH4_LITHIUM_SH4_H_
+#define V8_SH4_LITHIUM_SH4_H_
 
 #include "hydrogen.h"
 #include "lithium-allocator.h"
 #include "lithium.h"
 #include "safepoint-table.h"
 #include "utils.h"
 
 namespace v8 {
 namespace internal {
 
@@ skipping 2483 matching lines @@
   BailoutId pending_deoptimization_ast_id_;
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
-#endif  // V8_ARM_LITHIUM_ARM_H_
+#endif  // V8_SH4_LITHIUM_SH4_H_