2020-09-11  Tobias Burnus  <tobias@codesourcery.com>

	Backport from mainline
	2020-09-09  Tom de Vries  <tdevries@suse.de>

	* config/nvptx/atomic.c (__SYNC_SUBWORD_COMPARE_AND_SWAP): Fix
	Wbuiltin-declaration-mismatch.

2020-08-12  Kwok Cheung Yeung  <kcy@codesourcery.com>

	* config/nvptx/atomic.c: New.
	* config/nvptx/t-nvptx (LIB2ADD): Add atomic.c.