[clang] [Clang][ARM]Ensure both -mno-unaligned-access and -munaligned-access are passed to multilib selection logic (PR #134099)

[Simi Pallipurath via cfe-commits]

================
@@ -239,12 +239,12 @@ static void getAArch64MultilibFlags(const Driver &D,
     Result.push_back(BranchProtectionArg->getAsString(Args));
   }
 
-  if (Arg *AlignArg = Args.getLastArg(
-          options::OPT_mstrict_align, options::OPT_mno_strict_align,
-          options::OPT_mno_unaligned_access, options::OPT_munaligned_access)) {
-    if (AlignArg->getOption().matches(options::OPT_mstrict_align) ||
-        AlignArg->getOption().matches(options::OPT_mno_unaligned_access))
-      Result.push_back(AlignArg->getAsString(Args));
+  if (FeatureSet.contains("+strict-align")) {
----------------
simpal01 wrote:

Canonicalized unaligned access option to 
-mno-unaligned-access/-munaligned-access. multilib.yaml also uses the same 
options.

https://github.com/llvm/llvm-project/pull/134099
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