Use GetCurrentStackPosition() to calculate the stack limit.

The use of the address of a local variable causes problems with asan,
see https://build.chromium.org/p/tryserver.v8/builders/v8_linux64_asan_rel_ng_triggered/builds/7803

R=jochen@chromium.org

Review-Url: https://codereview.chromium.org/2317253006
Cr-Commit-Position: refs/heads/master@{#39330}

src/background-parsing-task.cc

@@ -63,8 +63,7 @@ void BackgroundParsingTask::Run() {
 
   // Reset the stack limit of the parser to reflect correctly that we're on a
   // background thread.
-  uintptr_t stack_limit =
-      reinterpret_cast<uintptr_t>(&stack_limit) - stack_size_ * KB;
+  uintptr_t stack_limit = GetCurrentStackPosition() - stack_size_ * KB;
   source_->parser->set_stack_limit(stack_limit);
 
   // Nullify the Isolate temporarily so that the background parser doesn't

src/compiler-dispatcher/compiler-dispatcher-job.cc

@@ -111,8 +111,7 @@ void CompilerDispatcherJob::Parse() {
   // use it.
   parse_info_->set_isolate(nullptr);
 
-  uintptr_t stack_limit =
-      reinterpret_cast<uintptr_t>(&stack_limit) - max_stack_size_ * KB;
+  uintptr_t stack_limit = GetCurrentStackPosition() - max_stack_size_ * KB;
 
   parser_->set_stack_limit(stack_limit);
   parser_->ParseOnBackground(parse_info_.get());
@@ -207,8 +206,7 @@ void CompilerDispatcherJob::Compile() {
   // Disallowing of handle dereference and heap access dealt with in
   // CompilationJob::ExecuteJob.
 
-  uintptr_t stack_limit =
-      reinterpret_cast<uintptr_t>(&stack_limit) - max_stack_size_ * KB;
+  uintptr_t stack_limit = GetCurrentStackPosition() - max_stack_size_ * KB;
   compile_job_->set_stack_limit(stack_limit);
 
   CompilationJob::Status status = compile_job_->ExecuteJob();