[lld] [lld-macho][arm64] Enhance safe ICF with thunk-based deduplication (PR #106573)

[via llvm-commits]

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@@ -175,6 +179,25 @@ void ARM64::populateThunk(InputSection *thunk, Symbol *funcSym) {
                              /*offset=*/0, /*addend=*/0,
                              /*referent=*/funcSym);
 }
+// Just a single direct branch to the target function.
+static constexpr uint32_t icfSafeThunkCode[] = {
+    0x14000000, // 08: b    target
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alx32 wrote:

LLD needs generic support for such scenarios - not only relating to this feature, but relating to code generation in general. So this is a general problem - and yes, we don't introduce any special feature to mitigate this for this situation. When generic support will be added for this scenario, we will be inheriting it.  

https://github.com/llvm/llvm-project/pull/106573