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

[David Spickett via cfe-commits]

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+// RUN: %clang --target=arm-none-eabi -mcpu=cortex-m85 -mfloat-abi=hard -O2 -save-temps=obj -S -o - %s | FileCheck %s
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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