[wasm] WasmRunner can run tests with I64 parameters and return value.

test/cctest/compiler/call-tester.h

Index: test/cctest/compiler/call-tester.h
diff --git a/test/cctest/compiler/call-tester.h b/test/cctest/compiler/call-tester.h
index 8ee6b99f3b0b977f14ab81eae4fe5f55f13ede9b..7741c8d43f20decd1197eeffd746bc0f7099617c 100644
--- a/test/cctest/compiler/call-tester.h
+++ b/test/cctest/compiler/call-tester.h
@@ -166,6 +166,8 @@ class CallHelper {
     return DoCall(FUNCTION_CAST<FType*>(Generate()), p1, p2, p3, p4, p5);
   }
 
+  CSignature* signature() const { return csig_; }
+
  protected:
   MachineSignature* csig_;