[clang] [llvm] [LFI] Add MCLFIRewriter infrastructure (PR #172906)

[Alexis Engelke via cfe-commits]

================
@@ -593,6 +594,8 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
     Triple T(Opts.Triple);
     Str.reset(TheTarget->createMCObjectStreamer(
         T, Ctx, std::move(MAB), std::move(OW), std::move(CE), *STI));
+    if (T.isLFI())
+      initializeLFIMCStreamer(*Str.get(), Ctx, T);
----------------
aengelke wrote:

Seems easy to miss and is likely missing in dozens of places? Couldn't createMCObjectStreamer do this?

https://github.com/llvm/llvm-project/pull/172906