[ARM][trivial] Use uppercase for code iterator names
* config/arm/iterators.md (shiftable_ops): Rename to...
(SHIFTABLE_OPS): ... This. Update use in comments.
(ior_xor): Rename to...
(IOR_XOR): ... This.
(vqh_ops): Rename to...
(VQH_OPS): ... This.
(vqhs_ops): Rename to...
(VQHS_OPS): ... This.
(rshifts): Rename to...
(RSHIFTS): ... This.
(returns): Rename to...
(RETURNS): ... This.
* config/arm/arm.md: Update uses of the above.
* config/arm/neon.md: Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@222416 138bc75d-0d04-0410-961f-82ee72b054a4