Rectify some test cases.

Rectify some test cases.

	PR testsuite/52641
	PR testsuite/109123
	PR testsuite/114661
	PR testsuite/117828
	PR testsuite/116481
	PR testsuite/91069
gcc/testsuite/
	* gcc.dg/Wuse-after-free-pr109123.c: Use size_t
	instead of long unsigned int.
	* gcc.dg/c23-tag-bitfields-1.c: Requires int32plus.
	* gcc.dg/pr114661.c: Same.
	* gcc.dg/pr117828.c: Same.
	* gcc.dg/flex-array-counted-by-2.c: Use uintptr_t
	instead of unsigned long.
	* gcc.dg/pr116481.c: Same.
	* gcc.dg/lto/tag-1_0.c: Use int32_t instead of int.
	* gcc.dg/lto/tag-1_1.c: Use int16_t instead of short.
	* gcc.dg/pr91069.c: Require double64.
	* gcc.dg/type-convert-var.c: Require double64plus.