testcase: rename pr111303.c to pr111324.c

When commit the fix for pr111324, the test cases was named as pr111303.c
by mistake.  Here, rename it to pr111324.c

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/pr111303.c: Rename to ...
	* gcc.dg/tree-ssa/pr111324.c: ... this.

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr111303.c b/gcc/testsuite/gcc.dg/tree-ssa/pr111324.c
similarity index 100%
rename from gcc/testsuite/gcc.dg/tree-ssa/pr111303.c
rename to gcc/testsuite/gcc.dg/tree-ssa/pr111324.c