[llvm] [AsmPrinter] Reduce AsmPrinterHandlers virt. fn calls (PR #96785)

[Alexis Engelke via llvm-commits]

================
@@ -382,13 +382,10 @@ class AsmPrinterHandlerTest : public AsmPrinterFixtureBase {
   public:
     TestHandler(AsmPrinterHandlerTest &Test) : Test(Test) {}
     virtual ~TestHandler() {}
-    virtual void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {}
     virtual void beginModule(Module *M) override { Test.BeginCount++; }
     virtual void endModule() override { Test.EndCount++; }
     virtual void beginFunction(const MachineFunction *MF) override {}
     virtual void endFunction(const MachineFunction *MF) override {}
-    virtual void beginInstruction(const MachineInstr *MI) override {}
----------------
aengelke wrote:

For this purpose, I already added `addDebugHandler` where you can add a DebugHandler(Base), which still allows to hook in at every instruction. Could you check whether this replacement suits your needs?

> reducing the internal instruction counter metric

That's one way to phrase it -- improving performance of every single compilation done by LLVM would be mine. :shrug: 

https://github.com/llvm/llvm-project/pull/96785