[flang] Handle logical constant value for quiet in STOP stmt

This patch handles the quiet argument in the STOP statement. It adds
ability to lower LOGICAL constant.

This patch is part of the upstreaming effort from fir-dev branch.

Reviewed By: kiranchandramohan, PeteSteinfeld

Differential Revision: https://reviews.llvm.org/D118897



Co-authored-by: Jean Perier <jperier@nvidia.com>