[MC] Remove the Parent parameter from MCFragment ctor callers. NFC

Author: MaskRay

llvm/include/llvm/MC/MCFragment.h

@@ -107,7 +107,7 @@ class MCFragment {
 
 class MCDummyFragment : public MCFragment {
 public:
-  explicit MCDummyFragment(MCSection *Sec) : MCFragment(FT_Dummy, false, Sec) {}
+  explicit MCDummyFragment() : MCFragment(FT_Dummy, false) {}
 
   static bool classof(const MCFragment *F) { return F->getKind() == FT_Dummy; }
 };

llvm/lib/MC/MCAssembler.cpp

@@ -829,7 +829,8 @@ void MCAssembler::layout(MCAsmLayout &Layout) {
     Sec->setLayoutOrder(i);
 
     // Chain together fragments from all subsections.
-    MCDummyFragment Dummy(Sec);
+    MCDummyFragment Dummy;
+    Dummy.setParent(Sec);
     MCFragment *Tail = &Dummy;
     for (auto &[_, List] : Sec->Subsections) {
       if (!List.Head)

llvm/lib/MC/MCObjectStreamer.cpp

@@ -567,8 +567,7 @@ void MCObjectStreamer::emitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
                                                  const MCSymbol *Label,
                                                  SMLoc Loc) {
   const MCExpr *AddrDelta = buildSymbolDiff(*this, Label, LastLabel, Loc);
-  insert(getContext().allocFragment<MCDwarfCallFrameFragment>(*AddrDelta,
-                                                              nullptr));
+  insert(getContext().allocFragment<MCDwarfCallFrameFragment>(*AddrDelta));
 }
 
 void MCObjectStreamer::emitCVLocDirective(unsigned FunctionId, unsigned FileNo,

llvm/lib/MC/MCSection.cpp

@@ -23,8 +23,9 @@ using namespace llvm;
 MCSection::MCSection(SectionVariant V, StringRef Name, bool IsText,
                      MCSymbol *Begin)
     : Begin(Begin), BundleGroupBeforeFirstInst(false), HasInstructions(false),
-      HasLayout(false), IsRegistered(false), IsText(IsText),
-      DummyFragment(this), Name(Name), Variant(V) {
+      HasLayout(false), IsRegistered(false), IsText(IsText), Name(Name),
+      Variant(V) {
+  DummyFragment.setParent(this);
   // The initial subsection number is 0. Create a fragment list.
   CurFragList = &Subsections.emplace_back(0u, FragList{}).second;
 }

llvm/lib/MC/MCSymbol.cpp

@@ -22,7 +22,7 @@
 using namespace llvm;
 
 // Only the address of this fragment is ever actually used.
-static MCDummyFragment SentinelFragment(nullptr);
+static MCDummyFragment SentinelFragment;
 
 // Sentinel value for the absolute pseudo fragment.
 MCFragment *MCSymbol::AbsolutePseudoFragment = &SentinelFragment;

llvm/lib/MC/MCWinCOFFStreamer.cpp

@@ -212,9 +212,7 @@ void MCWinCOFFStreamer::emitCOFFSymbolIndex(MCSymbol const *Symbol) {
   getAssembler().registerSection(*Sec);
   Sec->ensureMinAlignment(Align(4));
 
-  getContext().allocFragment<MCSymbolIdFragment>(Symbol,
-                                                 getCurrentSectionOnly());
-
+  insert(getContext().allocFragment<MCSymbolIdFragment>(Symbol));
   getAssembler().registerSymbol(*Symbol);
 }