Implementing comma operator for asm->wasm.

src/wasm/asm-wasm-builder.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/v8.h"
 
 #include "src/wasm/asm-wasm-builder.h"
 #include "src/wasm/wasm-macro-gen.h"
 #include "src/wasm/wasm-opcodes.h"
 
@@ skipping 1008 matching lines @@
           } else if (type == kUint32) {
             current_function_builder_->Emit(kExprI32RemU);
           } else if (type == kFloat64) {
             ModF64(expr);
             return;
           } else {
             UNREACHABLE();
           }
           break;
         }
+        case Token::COMMA: {
+          current_function_builder_->EmitWithU8(kExprBlock, 2);
+          break;
+        }
         default:
           UNREACHABLE();
       }
       RECURSE(Visit(expr->left()));
       RECURSE(Visit(expr->right()));
     }
   }
 
   void ModF64(BinaryOperation* expr) {
     current_function_builder_->EmitWithU8(kExprBlock, 3);
@@ skipping 241 matching lines @@
 // that zone in constructor may be thrown away once wasm module is written.
 WasmModuleIndex* AsmWasmBuilder::Run() {
   AsmWasmBuilderImpl impl(isolate_, zone_, literal_, foreign_);
   impl.Compile();
   WasmModuleWriter* writer = impl.builder_->Build(zone_);
   return writer->WriteTo(zone_);
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8