RFR: 8302830: AArch64: Fix the mismatch between cas.m4 and aarch64.ad

[Hao Sun]

Fix the following mismatch between cas.m4 and aarch64.ad.


$ m4 cas.m4 > cas.gen.ad
$ sed  '8930,9404!d' aarch64.ad > res.ad
$ diff -uN cas.gen.ad res.ad | cat -A

--- cas.gen.ad^I2023-02-20 04:18:46.624289978 +0000$
+++ res.ad^I2023-02-20 04:19:08.780351888 +0000$
@@ -15,7 +15,7 @@$
 // This pattern is generated automatically from cas.m4.$
 // DO NOT EDIT ANYTHING IN THIS SECTION OF THE FILE$
 instruct compareAndExchangeB(iRegINoSp res, indirect mem, iRegI oldval, iRegI newval, rFlagsReg cr) %{$
-  $
+$
   match(Set res (CompareAndExchangeB mem (Binary oldval newval)));$
   ins_cost(2 * VOLATILE_REF_COST);$
   effect(TEMP_DEF res, KILL cr);$
...


Besides, update the comment since "aarch_ad_cas.m4" was renamed to "cas.m4".

-------------

Commit messages:
 - 8302830: AArch64: Fix the mismatch between cas.m4 and aarch64.ad

Changes: https://git.openjdk.org/jdk/pull/12647/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12647&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302830
  Stats: 12 lines in 2 files changed: 0 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/12647.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12647/head:pull/12647

PR: https://git.openjdk.org/jdk/pull/12647