merge py3.7

--HG--
branch : py3.7-newtext-const-arg-caching
2 jobs for branch/py3.7-newtext-const-arg-caching in 8 minutes and 41 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #195442
check_rpython_annotations

00:07:38

passed #195443
hpy_tests

00:08:41