[binutils-gdb] gdb: Add test for some error cases of @entry usage

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT b1b189e04cb5ea5da1cbb07bd6cceccd4d2ac969 ***

Author: Andrew Burgess <andrew.burgess@embecosm.com>
Branch: master
Commit: b1b189e04cb5ea5da1cbb07bd6cceccd4d2ac969

gdb: Add test for some error cases of @entry usage

Adds a test that using @entry for a non-parameter, or for an unknown
symbol, both give the expected error.  This error message was
previously untested.

gdb/testsuite/ChangeLog:

	* gdb.arch/amd64-entry-value.exp: Test using @entry on a
	non-parameter, and on an unknown symbol.