[MC] Move AIX specific function to PPCAsmPrinter

https://reviews.llvm.org/D95518 used switchSectionNoPrint,
which seems buggy as .ll -> .s -> .o will be different from
.ll -> .o, but this change intends to be a NFC.

Author: MaskRay

llvm/include/llvm/MC/MCStreamer.h

@@ -1137,9 +1137,6 @@ class MCStreamer {
                                         const MCSymbol *LastLabel,
                                         const MCSymbol *Label,
                                         unsigned PointerSize) {}
-
-  /// Do finalization for the streamer at the end of a section.
-  virtual void doFinalizationAtSectionEnd(MCSection *Section) {}
 };
 
 /// Create a dummy machine code streamer, which does nothing. This is useful for

llvm/lib/MC/MCAsmStreamer.cpp

@@ -442,8 +442,6 @@ class MCAsmStreamer final : public MCStreamer {
   void emitDwarfAdvanceLineAddr(int64_t LineDelta, const MCSymbol *LastLabel,
                                 const MCSymbol *Label,
                                 unsigned PointerSize) override;
-
-  void doFinalizationAtSectionEnd(MCSection *Section) override;
 };
 
 } // end anonymous namespace.
@@ -2679,18 +2677,6 @@ void MCAsmStreamer::emitDwarfAdvanceLineAddr(int64_t LineDelta,
   emitIntValue(dwarf::DW_LNS_copy, 1);
 }
 
-void MCAsmStreamer::doFinalizationAtSectionEnd(MCSection *Section) {
-  // Emit section end. This is used to tell the debug line section where the end
-  // is for a text section if we don't use .loc to represent the debug line.
-  assert(MAI->isAIX());
-  switchSectionNoPrint(Section);
-
-  MCSymbol *Sym = getCurrentSectionOnly()->getEndSymbol(getContext());
-
-  if (!Sym->isInSection())
-    emitLabel(Sym);
-}
-
 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
                                     std::unique_ptr<formatted_raw_ostream> OS,
                                     MCInstPrinter *IP,

llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp

@@ -3247,9 +3247,15 @@ void PPCAIXAsmPrinter::emitInstruction(const MachineInstr *MI) {
 
 bool PPCAIXAsmPrinter::doFinalization(Module &M) {
   // Do streamer related finalization for DWARF.
-  if (hasDebugInfo())
-    OutStreamer->doFinalizationAtSectionEnd(
-        OutStreamer->getContext().getObjectFileInfo()->getTextSection());
+  if (hasDebugInfo()) {
+    // Emit section end. This is used to tell the debug line section where the
+    // end is for a text section if we don't use .loc to represent the debug
+    // line.
+    auto *Sec = OutContext.getObjectFileInfo()->getTextSection();
+    OutStreamer->switchSectionNoPrint(Sec);
+    MCSymbol *Sym = Sec->getEndSymbol(OutContext);
+    OutStreamer->emitLabel(Sym);
+  }
 
   for (MCSymbol *Sym : ExtSymSDNodeSymbols)
     OutStreamer->emitSymbolAttribute(Sym, MCSA_Extern);