First draft of the sh4 port

src/SConscript

 # 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 167 matching lines @@
     mips/frames-mips.cc
     mips/full-codegen-mips.cc
     mips/ic-mips.cc
     mips/lithium-codegen-mips.cc
     mips/lithium-gap-resolver-mips.cc
     mips/lithium-mips.cc
     mips/macro-assembler-mips.cc
     mips/regexp-macro-assembler-mips.cc
     mips/stub-cache-mips.cc
     """),
+  'arch:sh4': Split("""
+    sh4/assembler-sh4.cc
+    sh4/builtins-sh4.cc
+    sh4/code-stubs-sh4.cc
+    sh4/codegen-sh4.cc
+    sh4/constants-sh4.cc
+    sh4/cpu-sh4.cc
+    sh4/debug-sh4.cc
+    sh4/deoptimizer-sh4.cc
+    sh4/disasm-sh4.cc
+    sh4/frames-sh4.cc
+    sh4/full-codegen-sh4.cc
+    sh4/ic-sh4.cc
+    sh4/lithium-codegen-sh4.cc
+    sh4/lithium-gap-resolver-sh4.cc
+    sh4/lithium-sh4.cc
+    sh4/macro-assembler-sh4.cc
+    sh4/regexp-macro-assembler-sh4.cc
+    sh4/opcodes-sh4.cc
+    sh4/stub-cache-sh4.cc
+    """),
   'arch:ia32': Split("""
     ia32/assembler-ia32.cc
     ia32/builtins-ia32.cc
     ia32/code-stubs-ia32.cc
     ia32/codegen-ia32.cc
     ia32/cpu-ia32.cc
     ia32/debug-ia32.cc
     ia32/deoptimizer-ia32.cc
     ia32/disasm-ia32.cc
     ia32/frames-ia32.cc
@@ skipping 206 matching lines @@
       snapshot_cc = 'snapshot.cc'
     snapshot_obj = context.ConfigureObject(env, snapshot_cc, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
   library_objs = [non_snapshot_files, libraries_obj, experimental_libraries_obj, snapshot_obj]
   return (library_objs, d8_objs, [mksnapshot], preparser_objs)
 
 
 (library_objs, d8_objs, mksnapshot, preparser_objs) = ConfigureObjectFiles()
 Return('library_objs d8_objs mksnapshot preparser_objs')