[llvm] [Xtensa] Implement XtensaNullTargetStreamer (PR #203819)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Target/Xtensa/AsmParser/XtensaAsmParser.cpp llvm/lib/Target/Xtensa/MCTargetDesc/XtensaMCTargetDesc.cpp llvm/lib/Target/Xtensa/MCTargetDesc/XtensaTargetStreamer.h --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Target/Xtensa/MCTargetDesc/XtensaMCTargetDesc.cpp b/llvm/lib/Target/Xtensa/MCTargetDesc/XtensaMCTargetDesc.cpp
index 37902a0fc..397b56fb5 100644
--- a/llvm/lib/Target/Xtensa/MCTargetDesc/XtensaMCTargetDesc.cpp
+++ b/llvm/lib/Target/Xtensa/MCTargetDesc/XtensaMCTargetDesc.cpp
@@ -322,5 +322,5 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXtensaTargetMC() {
 
   // Register the null target streamer.
   TargetRegistry::RegisterNullTargetStreamer(getTheXtensaTarget(),
-                                              createXtensaNullTargetStreamer);
+                                             createXtensaNullTargetStreamer);
 }

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https://github.com/llvm/llvm-project/pull/203819