analyzer: add testcases for PR 93355 (intl/localealias.c leak)

analyzer: add testcases for PR 93355 (intl/localealias.c leak)

PR analyzer/93355 reports a missing diagnostic about a FILE leak in
intl/localealias.c.  This appears to be due to a issue in the
feasibility-checking code, though there is also a state explosion.

This patch adds test cases that I've been using when investigating this,
two of them currently requiring -fno-analyzer-feasibility, and one
currently requiring -Wno-analyzer-too-complex.

gcc/testsuite/ChangeLog:
	PR analyzer/93355
	* gcc.dg/analyzer/pr93355-localealias-feasibility.c: New test.
	* gcc.dg/analyzer/pr93355-localealias-simplified.c: New test.
	* gcc.dg/analyzer/pr93355-localealias.c: New test.