[clang] Add -mno-unaligned-access and -mbig-endian to ARM and AArch64 multilib flags (PR #114782)

[Lucas Duarte Prates via cfe-commits]

================
@@ -230,6 +230,17 @@ static void getAArch64MultilibFlags(const Driver &D,
     Result.push_back(BranchProtectionArg->getAsString(Args));
   }
 
+  const Arg *StrictAlignArg = Args.getLastArgNoClaim(
+      options::OPT_mstrict_align, options::OPT_mno_unaligned_access);
+  if (StrictAlignArg) {
+    Result.push_back(StrictAlignArg->getAsString(Args));
+  }
+
+  const Arg *BigEndian = Args.getLastArgNoClaim(options::OPT_mbig_endian);
----------------
pratlucas wrote:

I believe the same logic applies for `-mbig-endian` vs `-mlittle-endian`, where the last option provided takes effect over others. 

https://github.com/llvm/llvm-project/pull/114782