[llvm] [BOLT] Preserve Offset annotation in SCTC (PR #91693)

[Maksim Panchenko via llvm-commits]

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@@ -910,6 +910,9 @@ uint64_t SimplifyConditionalTailCalls::fixTailCalls(BinaryFunction &BF) {
       auto &CTCAnnotation =
           MIB->getOrCreateAnnotationAs<uint64_t>(*CondBranch, "CTCTakenCount");
       CTCAnnotation = CTCTakenFreq;
+      // Preserve Offset annotation, used for BAT
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maksfb wrote:

It deserves a detailed explanation why we propagate the offset annotation from `Instr`.

https://github.com/llvm/llvm-project/pull/91693