[clang] [llvm] [clang backend] In AArch64's DataLayout, specify a minimum function alignment of 4. (PR #90702)

[Doug Wyatt via llvm-commits]

================
@@ -5387,6 +5387,14 @@ std::string llvm::UpgradeDataLayoutString(StringRef DL, StringRef TT) {
     return Res;
   }
 
+  // AArch64 data layout upgrades.
+  if (T.isAArch64()) {
+    // Add "-Fn32"
+    if (!DL.contains("-Fn32"))
+      Res.append("-Fn32");
----------------
dougsonos wrote:

OK, thanks. I was afraid of that. I was copying two patterns - in ARM, `Fn8` seemed to be after any `p` and before `i`. In this file, the modifications are usually (always?) appending.

https://github.com/llvm/llvm-project/pull/90702