Use fixed-width types in allocation size tests

Use fixed-width types in allocation size tests

The patch changes the types inside the tests for the allocation size
checker to fixed-width types of stdint.h to account for different
architectures with different type widths.

2022-07-03  Tim Lange  <mail@tim-lange.me>

gcc/testsuite/ChangeLog:

	* gcc.dg/analyzer/allocation-size-1.c: Use fixed-length types.
	* gcc.dg/analyzer/allocation-size-2.c: Likewise.
	* gcc.dg/analyzer/allocation-size-3.c: Likewise.
	* gcc.dg/analyzer/allocation-size-4.c: Likewise.
	* gcc.dg/analyzer/allocation-size-5.c: Likewise.