[clang] [llvm] [X86][MC] Added support for -msse2avx option in llvm-mc (PR #96860)

[Shengchen Kan via cfe-commits]

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@@ -140,6 +141,10 @@ llvm::mc::RegisterMCTargetOptionsFlags::RegisterMCTargetOptionsFlags() {
       cl::init(true));
   MCBINDOPT(X86RelaxRelocations);
 
+  static cl::opt<bool> X86Sse2Avx(
+      "x86-sse2avx", cl::desc("Convert SSE Instructions to AVX Instructions"));
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KanRobert wrote:

Use the same help info as driver and GNU assembler.

Specify that the assembler should encode SSE instructions with VEX prefix

https://github.com/llvm/llvm-project/pull/96860