testsuite/52641: Fix more of implicit int=32 assumption fallout.

testsuite/52641: Fix more of implicit int=32 assumption fallout.

gcc/testsuite/
	PR testsuite/52641
	* gcc.dg/torture/pr107451.c: Require int32plus.
	* gcc.dg/torture/pr108574-3.c: Use __INT32_TYPE__ instead of int.
	* gcc.dg/torture/pr109940.c: Use __INTPTR_TYPE__ instead of long.
	* gcc.dg/torture/pr95248.c: Require size24plus.
	* gcc.dg/torture/pr95295-3.c: Use var_* with at least 32 bits int.
	* gcc.dg/torture/pr98640.c: Cast to __INT32_TYPE__ instead of int.
	* gcc.dg/tree-ssa/pr103771.c: Use int with at least 32 bits.