[llvm] [clang] [llvm][ARM] Emit MVE .arch_extension after .fpu directive if it does not include MVE features (PR #71545)

[David Spickett via llvm-commits]

================
@@ -0,0 +1,35 @@
+// RUN: %clang --target=arm-none-eabi -mcpu=cortex-m85 -mfloat-abi=hard -O2 -save-temps=obj -S -o - %s | FileCheck %s
----------------
DavidSpickett wrote:

Should there be an m55 test for this as well, as you've got 55 and 85 for save-temps.

https://github.com/llvm/llvm-project/pull/71545