[wasm] Track in the interpreter if a NaN could have been produced.

test/cctest/wasm/wasm-run-utils.h

Index: test/cctest/wasm/wasm-run-utils.h
diff --git a/test/cctest/wasm/wasm-run-utils.h b/test/cctest/wasm/wasm-run-utils.h
index 9f61c7a19f4a2505ad85e09bc10b4a552ff4485e..0599a40dafbfe4b81f69c3bd8edff7c630f797a0 100644
--- a/test/cctest/wasm/wasm-run-utils.h
+++ b/test/cctest/wasm/wasm-run-utils.h
@@ -626,7 +626,8 @@ class WasmRunner {
         compiled_(false),
         signature_(MachineTypeForC<ReturnType>() == MachineType::None() ? 0 : 1,
                    GetParameterCount(p0, p1, p2, p3), storage_),
-        compiler_(&signature_, module) {
+        compiler_(&signature_, module),
+        may_produced_nan_(false) {
     DCHECK(module);
     InitSigStorage(p0, p1, p2, p3);
   }
@@ -736,6 +737,7 @@ class WasmRunner {
     thread->PushFrame(compiler_.function_, args.start());
     if (thread->Run() == WasmInterpreter::FINISHED) {
       WasmVal val = thread->GetReturnValue();
+      may_produced_nan_ |= thread->MayProducedNaN();
       return val.to<ReturnType>();
     } else if (thread->state() == WasmInterpreter::TRAPPED) {
       // TODO(titzer): return the correct trap code
@@ -752,6 +754,7 @@ class WasmRunner {
 
   WasmFunction* function() { return compiler_.function_; }
   WasmInterpreter* interpreter() { return compiler_.interpreter_; }
+  bool may_produced_nan() { return may_produced_nan_; }
 
  protected:
   v8::internal::AccountingAllocator allocator_;
@@ -761,6 +764,7 @@ class WasmRunner {
   FunctionSig signature_;
   WasmFunctionCompiler compiler_;
   WasmFunctionWrapper<ReturnType> wrapper_;
+  bool may_produced_nan_;
 
   bool interpret() { return compiler_.execution_mode_ == kExecuteInterpreted; }