[clang] [llvm] [BPF] Add load-acquire and store-release instructions under -mcpu=v4 (PR #108636)

[Yingchi Long via cfe-commits]

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+; RUN: llc < %s -march=bpfel -mcpu=v4 -verify-machineinstrs -show-mc-encoding \
+; RUN:   | FileCheck -check-prefixes=CHECK-LE %s
+; RUN: llc < %s -march=bpfeb -mcpu=v4 -verify-machineinstrs -show-mc-encoding \
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inclyc wrote:

same

https://github.com/llvm/llvm-project/pull/108636