[llvm] [llvm-objdump][AVR] Detect AVR architecture from ELF flags for disassembling (PR #174731)

[James Henderson via llvm-commits]

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+## When --mattr and --mcpu are both empty, disassemble ELF with e_flags derived feature.
+# RUN: yaml2obj -DARCH_ARCHVERSION=ARCH_AVR1 %s -o %t.avr1
+# RUN: llvm-objdump -d %t.avr1 | FileCheck %s --check-prefixes=AVR1
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jh7370 wrote:

Nit: it's more conventional to use `--check-prefix` instead of `--check-prefixes` when there's only one prefix for a given run of FileCheck.

https://github.com/llvm/llvm-project/pull/174731