[llvm] MC: Restructure MCFragment as a fixed part and a variable tail (PR #148544)

[Alexis Engelke via llvm-commits]

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@@ -95,7 +95,7 @@ class MCObjectStreamer : public MCStreamer {
   /// fragment is not a data fragment.
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aengelke wrote:

Maybe document explicitly that this only returns `FT_Data` fragments (i.e. no variable content)?

https://github.com/llvm/llvm-project/pull/148544