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

test/common/wasm/wasm-module-runner.cc

Index: test/common/wasm/wasm-module-runner.cc
diff --git a/test/common/wasm/wasm-module-runner.cc b/test/common/wasm/wasm-module-runner.cc
index 01c4b624b09a08e542acbcf46db826b17e56e8f1..a4730e2f3dec19f1f88764698e920a5e3a48c02e 100644
--- a/test/common/wasm/wasm-module-runner.cc
+++ b/test/common/wasm/wasm-module-runner.cc
@@ -114,7 +114,7 @@ int32_t CompileAndRunWasmModule(Isolate* isolate, const byte* module_start,
 
 int32_t InterpretWasmModule(Isolate* isolate, ErrorThrower* thrower,
                             const WasmModule* module, int function_index,
-                            WasmVal* args) {
+                            WasmVal* args, bool* may_produced_nan) {

[titzer, 2016/10/20 13:45:48]

name this also possible_nondeterminism?

[ahaas, 2016/10/20 13:48:34]

Done.

   CHECK(module != nullptr);
 
   Zone zone(isolate->allocator(), ZONE_NAME);
@@ -165,6 +165,7 @@ int32_t InterpretWasmModule(Isolate* isolate, ErrorThrower* thrower,
   if (instance.mem_start) {
     free(instance.mem_start);
   }
+  *may_produced_nan = thread->PossibleNondeterminism();
   if (interpreter_result == WasmInterpreter::FINISHED) {
     WasmVal val = thread->GetReturnValue();
     return val.to<int32_t>();