MCSymbol: Remove the default argument of getFragment

Follow-up to ca5b3a0
("[MC] Remove SetUsed on isUndefined and getFragment").

The upcoming change will allow .set to reassign non-absolute values,
removing `IsUsed`.

Author: MaskRay

llvm/include/llvm/MC/MCSymbol.h

@@ -258,7 +258,7 @@ class MCSymbol {
   /// isInSection - Check if this symbol is defined in some section (i.e., it
   /// is defined but not absolute).
   bool isInSection() const {
-    auto *F = getFragment(0);
+    auto *F = getFragment();
     return F && F != AbsolutePseudoFragment;
   }
 
@@ -399,12 +399,12 @@ class MCSymbol {
     return SymbolContents == SymContentsTargetCommon;
   }
 
-  MCFragment *getFragment(bool SetUsed = false) const {
+  MCFragment *getFragment() const {
     if (Fragment || !isVariable() || isWeakExternal())
       return Fragment;
     // If the symbol is a non-weak alias, get information about
     // the aliasee. (Don't try to resolve weak aliases.)
-    Fragment = getVariableValue(SetUsed)->findAssociatedFragment();
+    Fragment = getVariableValue(false)->findAssociatedFragment();
     return Fragment;
   }
 

llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp

@@ -878,7 +878,7 @@ void X86AsmBackend::finishLayout(MCAssembler const &Asm) const {
   // disabled by default to eliminate the -g vs non -g difference.
   DenseSet<MCFragment *> LabeledFragments;
   for (const MCSymbol &S : Asm.symbols())
-    LabeledFragments.insert(S.getFragment(false));
+    LabeledFragments.insert(S.getFragment());
 
   for (MCSection &Sec : Asm) {
     if (!Sec.isText())