elf: Use uint64_t for common symbol alignment warning

Use uint64_t for common symbol alignment warning to avoid

elflink.c:5548:12: runtime error: shift exponent 37 is too large for 32-bit type 'int'

with invalid input in PR ld/33500.  Now ld issues:

ld: warning: alignment 137438953472 of common symbol `__afl_global_area_ptr' in pr33500.o is greater than the alignment (8) of its section *COM*

instead of

ld: warning: alignment 32 of common symbol `__afl_global_area_ptr' in pr33500.o is greater than the alignment (8) of its section *COM*

	PR ld/33511
	* elflink.c (elf_link_add_object_symbols): Use uint64_t for
	common symbol alignment warning.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>