Convert BindingExplicitlySet into a MCSymbolELF field.

I will pack it better in a followup patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238975 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCELFStreamer.h

@@ -37,7 +37,6 @@ public:
   void reset() override {
     SeenIdent = false;
     LocalCommons.clear();
-    BindingExplicitlySet.clear();
     BundleGroups.clear();
     MCObjectStreamer::reset();
   }
@@ -106,8 +105,6 @@ private:
 
   std::vector<LocalCommon> LocalCommons;
 
-  SmallPtrSet<MCSymbol *, 16> BindingExplicitlySet;
-
   /// BundleGroups - The stack of fragments holding the bundle-locked
   /// instructions.
   llvm::SmallVector<MCDataFragment *, 4> BundleGroups;

include/llvm/MC/MCSymbolELF.h

@@ -17,9 +17,11 @@ class MCSymbolELF : public MCSymbol {
   /// symbol has no size this field will be NULL.
   const MCExpr *SymbolSize = nullptr;
 
+  mutable unsigned BindingSet : 1;
+
 public:
   MCSymbolELF(const StringMapEntry<bool> *Name, bool isTemporary)
-      : MCSymbol(true, Name, isTemporary) {}
+      : MCSymbol(true, Name, isTemporary), BindingSet(false) {}
   void setSize(const MCExpr *SS) { SymbolSize = SS; }
 
   const MCExpr *getSize() const { return SymbolSize; }
@@ -36,6 +38,8 @@ public:
   void setBinding(unsigned Binding) const;
   unsigned getBinding() const;
 
+  bool isBindingSet() const { return BindingSet; }
+
   static bool classof(const MCSymbol *S) { return S->isELF(); }
 };
 }