First draft of the sh4 port

src/SConscript

Index: src/SConscript
diff --git a/src/SConscript b/src/SConscript
index 16bfb55b3875a4832b86cbe94c0f64ea1733fa49..9ef6fea844f5790ff81179c86a9f57f79402852d 100755
--- a/src/SConscript
+++ b/src/SConscript
@@ -185,6 +185,27 @@ SOURCES = {
     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