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

test/cctest/compiler/function-tester.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "test/cctest/compiler/function-tester.h"
 
 #include "src/ast/ast-numbering.h"
 #include "src/compilation-info.h"
 #include "src/compiler.h"
 #include "src/compiler/linkage.h"
@@ skipping 56 matching lines @@
   Handle<Object> args[] = {a, b, c};
   return Execution::Call(isolate, function, undefined(), 3, args);
 }
 
 MaybeHandle<Object> FunctionTester::Call(Handle<Object> a, Handle<Object> b,
                                          Handle<Object> c, Handle<Object> d) {
   Handle<Object> args[] = {a, b, c, d};
   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);
   CHECK(isolate->has_pending_exception());
   CHECK(try_catch.HasCaught());
   CHECK(no_result.is_null());
   isolate->OptionalRescheduleException(true);
 }
 
 v8::Local<v8::Message> FunctionTester::CheckThrowsReturnMessage(
@@ skipping 107 matching lines @@
 
   Handle<Code> code = Pipeline::GenerateCodeForTesting(&info, graph);
   CHECK(!code.is_null());
   function->ReplaceCode(*code);
   return function;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8