[llvm] [X86][MC] Support instructions of MSR_IMM (PR #113524)

[Phoebe Wang via llvm-commits]

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+// RUN: llvm-mc -triple x86_64 --show-encoding %s | FileCheck %s
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phoebewang wrote:

Add `# RUN: not llvm-mc -triple i386 -show-encoding %s 2>&1 | FileCheck %s --check-prefix=ERROR` ?

https://github.com/llvm/llvm-project/pull/113524