https://git.ruby-lang.org/ruby.git/commit/?id=0dea31c437

From 0dea31c437abc59c80ece31e94cc5f8fb562c3e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Tue, 21 Sep 2021 14:05:19 +0900
Subject: RBIMPL_ATTR_NOALIAS: not until LLVM 12

I observed CI failures.
https://github.com/ruby/ruby/actions/runs/1240165911

It turns out that  RBIMPL_ATTR_NOALIAS was not mature before.  Skip
using it for old clang, and everything work as expected.
---
 include/ruby/internal/attr/noalias.h | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/include/ruby/internal/attr/noalias.h b/include/ruby/internal/attr/noalias.h
index 8e508b2..0790ef6 100644
--- a/include/ruby/internal/attr/noalias.h
+++ b/include/ruby/internal/attr/noalias.h
@@ -46,10 +46,21 @@ https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/attr/noalias.h#L46
  *       that has to  be passed to the function as  a pointer.  ::VALUE -taking
  *       functions thus cannot be attributed as such.
  */
+#include "ruby/internal/compiler_since.h"
 #include "ruby/internal/has/declspec_attribute.h"
 
 /** Wraps (or simulates) `__declspec((noalias))` */
-#if RBIMPL_HAS_DECLSPEC_ATTRIBUTE(noalias)
+#if RBIMPL_COMPILER_BEFORE(Clang, 12, 0, 0)
+# /*
+#  * `::llvm::Attribute::ArgMemOnly`  was buggy  before.  Maybe  because nobody
+#  * actually seriously used it.  It seems they somehow mitigated the situation
+#  * in  LLVM  12.  Still  not  found  the  exact  changeset which  fiexed  the
+#  * attribute, though.
+#  *
+#  * :FIXME: others (armclang, xlclang, ...) can also be affected?
+#  */
+# define RBIMPL_ATTR_NOALIAS() /* void */
+#elif RBIMPL_HAS_DECLSPEC_ATTRIBUTE(noalias)
 # define RBIMPL_ATTR_NOALIAS() __declspec(noalias)
 #else
 # define RBIMPL_ATTR_NOALIAS() /* void */
-- 
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