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

src/codegen.cc

 // Copyright 2012 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/codegen.h"
 
 #if defined(V8_OS_AIX)
 #include <fenv.h>  // NOLINT(build/c++11)
 #endif
 
@@ skipping 219 matching lines @@
   }
 
 #ifdef ENABLE_DISASSEMBLER
   AllowDeferredHandleDereference allow_deference_for_print_code;
   Isolate* isolate = info->isolate();
   bool print_code =
       isolate->bootstrapper()->IsActive()
           ? FLAG_print_builtin_code
           : (FLAG_print_code || (info->IsStub() && FLAG_print_code_stubs) ||
              (info->IsOptimizing() && FLAG_print_opt_code &&
-              info->shared_info()->PassesFilter(FLAG_print_opt_code_filter)));
+              info->shared_info()->PassesFilter(FLAG_print_opt_code_filter)) ||
+             (info->IsWasm() && FLAG_print_wasm_code));
   if (print_code) {
     std::unique_ptr<char[]> debug_name = info->GetDebugName();
     CodeTracer::Scope tracing_scope(info->isolate()->GetCodeTracer());
     OFStream os(tracing_scope.file());
 
     // Print the source code if available.
     bool print_source =
         info->parse_info() && (code->kind() == Code::OPTIMIZED_FUNCTION ||
                                code->kind() == Code::FUNCTION);
     if (print_source) {
@@ skipping 30 matching lines @@
       os << "source_position = " << shared->start_position() << "\n";
     }
     code->Disassemble(debug_name.get(), os);
     os << "--- End code ---\n";
   }
 #endif  // ENABLE_DISASSEMBLER
 }
 
 }  // namespace internal
 }  // namespace v8