type_align: handle range types the same as ints and enums

type_align: handle range types the same as ints and enums

This commit enhances type_align to handle TYPE_CODE_RANGE types
the same as integers and enums, rather than returning zero,
which means for this function that it could not determine its
alignment.

gdb/ChangeLog:

	* gdbtypes.c (type_align): Handle TYPE_CODE_RANGE the same as
        integers and enumeration types.

Tested on x86_64-linux. Also tested on a variety of platforms
(with CPUs being ARM, AArch64, Leon3 (SPARC-like), PowerPC,
PowerPC64, RV64, Visium, x86, x86_64).