[llvm] [X86] Reimplement bundle alignment mode (PR #175830)

[Fangrui Song via llvm-commits]

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@@ -317,6 +334,79 @@ void MCELFStreamer::emitIdent(StringRef IdentString) {
   popSection();
 }
 
+void MCELFStreamer::emitBundleAlignMode(Align Alignment) {
+  assert(Log2(Alignment) <= 30 && "Invalid bundle alignment");
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MaskRay wrote:

If reachable, don't use `assert`.

https://github.com/llvm/llvm-project/pull/175830