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

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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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simpal01 wrote:

Done

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