[llvm] [BOLT] Add support for safe-icf (PR #116275)

[Davide Italiano via llvm-commits]

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@@ -1945,6 +2017,27 @@ static void printDebugInfo(raw_ostream &OS, const MCInst &Instruction,
     OS << " discriminator:" << Row.Discriminator;
 }
 
+static bool skipInstruction(const MCInst &Inst, const BinaryContext &BC) {
+  const bool IsX86 = BC.isX86();
+  return (BC.MIB->isPseudo(Inst) || BC.MIB->isUnconditionalBranch(Inst) ||
+          (IsX86 && BC.MIB->isConditionalBranch(Inst)) ||
+          BC.MIB->isCall(Inst) || BC.MIB->isBranch(Inst));
+}
+void BinaryContext::processInstructionForFuncReferences(const MCInst &Inst) {
+  if (ICFLevelVar != ICFLevel::Safe || skipInstruction(Inst, *this))
+    return;
+  for (const MCOperand &Op : MCPlus::primeOperands(Inst)) {
+    if (Op.isExpr()) {
----------------
dcci wrote:

you can greatly reduce the indentation of this code, e.g.

```
if (!Op.isExpr())
   continue;
[...]
```

https://github.com/llvm/llvm-project/pull/116275