[wasm] Add utilities to print out WASM ast directly from the bytes.

src/compiler/arm64/code-generator-arm64.cc

 // Copyright 2014 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/code-generator.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 1473 matching lines @@
     __ Pop(fp, lr);
   } else if (frame()->needs_frame()) {
     // Canonicalize JSFunction return sites for now.
     if (return_label_.is_bound()) {
       __ B(&return_label_);
       return;
     } else {
       __ Bind(&return_label_);
       if (descriptor->UseNativeStack()) {
         __ Mov(csp, fp);
+        pop_count += (pop_count & 1);  // align
       } else {
         __ Mov(jssp, fp);
       }
       __ Pop(fp, lr);
     }
   } else if (descriptor->UseNativeStack()) {
-    pop_count += (pop_count & 1);
+    pop_count += (pop_count & 1);  // align
   }
   __ Drop(pop_count);
   __ Ret();
 }
 
 
 void CodeGenerator::AssembleMove(InstructionOperand* source,
                                  InstructionOperand* destination) {
   Arm64OperandConverter g(this, nullptr);
   // Dispatch on the source and destination operand kinds.  Not all
@@ skipping 175 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8