[binutils-gdb] aarc64-linux-nat: Use ptid from regcache instead of inferior_ptid

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 551196862e4e9dfda510f59c53b0a3ff3153e4ed ***

Author: Simon Marchi <simon.marchi@polymtl.ca>
Branch: master
Commit: 551196862e4e9dfda510f59c53b0a3ff3153e4ed

aarc64-linux-nat: Use ptid from regcache instead of inferior_ptid

gdb/ChangeLog:

	* aarch64-linux-nat.c (fetch_gregs_from_thread,
	store_gregs_to_thread, fetch_fpregs_from_thread,
	store_fpregs_to_thread): Use regcache->ptid instead of
	inferior_ptid.