[wasm] Introduce the --print-wasm-code flag to print wasm code.

src/compiler/wasm-compiler.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/wasm-compiler.h"
 
 #include <memory>
 
 #include "src/isolate-inl.h"
 
@@ skipping 3982 matching lines @@
     return Handle<Code>::null();
   }
   if (job_->FinalizeJob() != CompilationJob::SUCCEEDED) {
     return Handle<Code>::null();
   }
   base::ElapsedTimer compile_timer;
   if (FLAG_trace_wasm_decode_time) {
     compile_timer.Start();
   }
   Handle<Code> code = info_.code();
+  if (FLAG_print_wasm_code) {

[titzer, 2017/01/27 14:03:21]

Despite the mess in src/codegen.cc, I think this somehow belongs there.

[ahaas, 2017/02/10 10:21:48]

Done.

+    code->Print();
+  }
   DCHECK(!code.is_null());
 
   if (isolate_->logger()->is_logging_code_events() ||
       isolate_->is_profiling()) {
     RecordFunctionCompilation(CodeEventListener::FUNCTION_TAG, isolate_, code,
                               "WASM_function", function_->func_index,
                               wasm::WasmName("module"),
                               module_env_->wire_bytes.GetName(function_));
   }
 
@@ skipping 22 matching lines @@
                       Smi::FromInt(instruction.instr_offset));
     fn_protected->set(Code::kTrapDataSize * i + Code::kTrapLandingOffset,
                       Smi::FromInt(instruction.landing_offset));
   }
   return fn_protected;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8