[AArch64] Rename UNSPEC_WHILE* to match instruction mnemonics

[AArch64] Rename UNSPEC_WHILE* to match instruction mnemonics

The UNSPEC_WHILE*s had an underscore before the condition code,
whereas almost all other SVE unspecs are taken directly from
the mnemonic.

2020-01-09  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/aarch64/aarch64.md (UNSPEC_WHILE_LE): Rename to...
	(UNSPEC_WHILELE): ...this.
	(UNSPEC_WHILE_LO): Rename to...
	(UNSPEC_WHILELO): ...this.
	(UNSPEC_WHILE_LS): Rename to...
	(UNSPEC_WHILELS): ...this.
	(UNSPEC_WHILE_LT): Rename to...
	(UNSPEC_WHILELT): ...this.
	* config/aarch64/iterators.md (SVE_WHILE): Update accordingly.
	(cmp_op, while_optab_cmp): Likewise.
	* config/aarch64/aarch64.c (aarch64_sve_move_pred_via_while): Likewise.
	* config/aarch64/aarch64-sve-builtins-base.cc (svwhilele): Likewise.
	(svwhilelt): Likewise.

From-SVN: r280053