[csa] Fix CSA::ToUint32 rounding for negative HeapNumbers

test/cctest/compiler/function-tester.cc

Index: test/cctest/compiler/function-tester.cc
diff --git a/test/cctest/compiler/function-tester.cc b/test/cctest/compiler/function-tester.cc
index 4776689995546330287b9e80e0621ffa726ebe87..b3c226491545c8abbf12731ed0767d7ed252f020 100644
--- a/test/cctest/compiler/function-tester.cc
+++ b/test/cctest/compiler/function-tester.cc
@@ -74,6 +74,15 @@ MaybeHandle<Object> FunctionTester::Call(Handle<Object> a, Handle<Object> b,
   return Execution::Call(isolate, function, undefined(), 4, args);
 }
 
+void FunctionTester::CheckThrows(Handle<Object> a) {
+  TryCatch try_catch(reinterpret_cast<v8::Isolate*>(isolate));
+  MaybeHandle<Object> no_result = Call(a);
+  CHECK(isolate->has_pending_exception());
+  CHECK(try_catch.HasCaught());
+  CHECK(no_result.is_null());
+  isolate->OptionalRescheduleException(true);
+}
+
 void FunctionTester::CheckThrows(Handle<Object> a, Handle<Object> b) {
   TryCatch try_catch(reinterpret_cast<v8::Isolate*>(isolate));
   MaybeHandle<Object> no_result = Call(a, b);