make the art thread pool use the exact stack_size

There have been some scenarios not using the default-sized stack,
which may be 64K(e.g. https://android.googlesource.com/platform/art/+/refs/heads/master/runtime/runtime.cc#1058)
using the exact stack_size to save process memory.

Signed-off-by: eric.yan <eric.yan@oneplus.com>
Change-Id: I3fe31a8b152a982b35cfe2f0b967a43e01320a14
1 file changed