First draft of the sh4 port

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index d81d4ae61480fe13483d3a5fdebf1a38d7f05bd2..a1f0b150d9dac75a2994fb18ebde58c66cf343ba 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -63,6 +63,8 @@
 #include "arm/assembler-arm-inl.h"
 #elif V8_TARGET_ARCH_MIPS
 #include "mips/assembler-mips-inl.h"
+#elif V8_TARGET_ARCH_SH4
+#include "sh4/assembler-sh4-inl.h"
 #else
 #error "Unknown architecture."
 #endif
@@ -77,6 +79,8 @@
 #include "arm/regexp-macro-assembler-arm.h"
 #elif V8_TARGET_ARCH_MIPS
 #include "mips/regexp-macro-assembler-mips.h"
+#elif V8_TARGET_ARCH_SH4
+#include "sh4/regexp-macro-assembler-sh4.h"
 #else  // Unknown architecture.
 #error "Unknown architecture."
 #endif  // Target architecture.
@@ -1066,6 +1070,8 @@ ExternalReference ExternalReference::re_check_stack_guard_state(
   function = FUNCTION_ADDR(RegExpMacroAssemblerARM::CheckStackGuardState);
 #elif V8_TARGET_ARCH_MIPS
   function = FUNCTION_ADDR(RegExpMacroAssemblerMIPS::CheckStackGuardState);
+#elif V8_TARGET_ARCH_SH4
+  function = FUNCTION_ADDR(RegExpMacroAssemblerSH4::CheckStackGuardState);
 #else
   UNREACHABLE();
 #endif