Add tool to visualize machine code/lithium.

src/codegen.cc

Index: src/codegen.cc
diff --git a/src/codegen.cc b/src/codegen.cc
index b15324c8cf0ba6f98a7a8fa481f58bc2de0606bb..7b2f81ba8ab0e3ea85595fd18ec6d3664904e71e 100644
--- a/src/codegen.cc
+++ b/src/codegen.cc
@@ -134,7 +134,9 @@ void CodeGenerator::PrintCode(Handle<Code> code, CompilationInfo* info) {
   if (print_code) {
     // Print the source code if available.
     FunctionLiteral* function = info->function();
-    if (code->kind() == Code::OPTIMIZED_FUNCTION) {
+    bool print_source = code->kind() == Code::OPTIMIZED_FUNCTION ||
+        code->kind() == Code::FUNCTION;
+    if (print_source) {
       Handle<Script> script = info->script();
       if (!script->IsUndefined() && !script->source()->IsUndefined()) {
         PrintF("--- Raw source ---\n");
@@ -162,12 +164,16 @@ void CodeGenerator::PrintCode(Handle<Code> code, CompilationInfo* info) {
     } else {
       PrintF("--- Code ---\n");
     }
+    if (print_source) {
+      PrintF("source_position = %d\n", function->start_position());
+    }
     if (info->IsStub()) {
       CodeStub::Major major_key = info->code_stub()->MajorKey();
       code->Disassemble(CodeStub::MajorName(major_key, false));
     } else {
       code->Disassemble(*function->debug_name()->ToCString());
     }
+    PrintF("--- End code ---\n");
   }
 #endif  // ENABLE_DISASSEMBLER
 }