[wasm] Fix I32ReinterpretF32 and I64ReinterpretF64 on ia32.

test/cctest/wasm/test-run-wasm-64.cc

Index: test/cctest/wasm/test-run-wasm-64.cc
diff --git a/test/cctest/wasm/test-run-wasm-64.cc b/test/cctest/wasm/test-run-wasm-64.cc
index e28273d3bed2617a021fc9b9e50dba1a19448d4d..3b0be74595ba0046f2a7832ef75f87f303dd4b2b 100644
--- a/test/cctest/wasm/test-run-wasm-64.cc
+++ b/test/cctest/wasm/test-run-wasm-64.cc
@@ -1319,6 +1319,16 @@ WASM_EXEC_TEST(I64ReinterpretF64) {
   }
 }
 
+WASM_EXEC_TEST(SignallingNanSurvivesI64ReinterpretF64) {
+  REQUIRE(I64ReinterpretF64);
+  WasmRunner<int64_t> r(execution_mode);
+  BUILD(r, WASM_I64_REINTERPRET_F64(WASM_SEQ(kExprF64Const, 0x00, 0x00, 0x00,
+                                             0x00, 0x00, 0x00, 0xf4, 0x7f)));
+
+  // This is a signalling nan.
+  CHECK_EQ(0x7ff4000000000000, r.Call());
+}
+
 WASM_EXEC_TEST(F64ReinterpretI64) {
   REQUIRE(F64ReinterpretI64);
   WasmRunner<int64_t, int64_t> r(execution_mode);