llvm-mc: Make MCSymbolData symbol member const.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80573 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/MC/MCAssembler.h b/include/llvm/MC/MCAssembler.h
index adafcd6..44fc2e1 100644
--- a/include/llvm/MC/MCAssembler.h
+++ b/include/llvm/MC/MCAssembler.h
@@ -437,7 +437,7 @@
 // FIXME: Same concerns as with SectionData.
 class MCSymbolData : public ilist_node<MCSymbolData> {
 public:
-  MCSymbol &Symbol;
+  const MCSymbol &Symbol;
 
   /// Fragment - The fragment this symbol's value is relative to, if any.
   MCFragment *Fragment;
@@ -474,13 +474,13 @@
 public:
   // Only for use as sentinel.
   MCSymbolData();
-  MCSymbolData(MCSymbol &_Symbol, MCFragment *_Fragment, uint64_t _Offset,
+  MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment, uint64_t _Offset,
                MCAssembler *A = 0);
 
   /// @name Accessors
   /// @{
 
-  MCSymbol &getSymbol() const { return Symbol; }
+  const MCSymbol &getSymbol() const { return Symbol; }
 
   MCFragment *getFragment() const { return Fragment; }
   void setFragment(MCFragment *Value) { Fragment = Value; }
diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp
index fe3d2d1..21246cc 100644
--- a/lib/MC/MCAssembler.cpp
+++ b/lib/MC/MCAssembler.cpp
@@ -331,7 +331,7 @@
 
   void WriteNlist32(MachSymbolData &MSD) {
     MCSymbolData &Data = *MSD.SymbolData;
-    MCSymbol &Symbol = Data.getSymbol();
+    const MCSymbol &Symbol = Data.getSymbol();
     uint8_t Type = 0;
     uint16_t Flags = Data.getFlags();
     uint32_t Address = 0;
@@ -592,7 +592,7 @@
     // files.
     for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
            ie = Asm.symbol_end(); it != ie; ++it) {
-      MCSymbol &Symbol = it->getSymbol();
+      const MCSymbol &Symbol = it->getSymbol();
 
       // Ignore assembler temporaries.
       if (it->getSymbol().isTemporary())
@@ -628,7 +628,7 @@
     // Now add the data for local symbols.
     for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
            ie = Asm.symbol_end(); it != ie; ++it) {
-      MCSymbol &Symbol = it->getSymbol();
+      const MCSymbol &Symbol = it->getSymbol();
 
       // Ignore assembler temporaries.
       if (it->getSymbol().isTemporary())
@@ -926,9 +926,9 @@
                                                        
 /* *** */
 
-MCSymbolData::MCSymbolData() : Symbol(*(MCSymbol*)0) {}
+MCSymbolData::MCSymbolData() : Symbol(*(const MCSymbol*)0) {}
 
-MCSymbolData::MCSymbolData(MCSymbol &_Symbol, MCFragment *_Fragment,
+MCSymbolData::MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment,
                            uint64_t _Offset, MCAssembler *A)
   : Symbol(_Symbol), Fragment(_Fragment), Offset(_Offset),
     IsExternal(false), IsPrivateExtern(false),
diff --git a/lib/MC/MCMachOStreamer.cpp b/lib/MC/MCMachOStreamer.cpp
index 87ea99f..5a7b01b 100644
--- a/lib/MC/MCMachOStreamer.cpp
+++ b/lib/MC/MCMachOStreamer.cpp
@@ -72,7 +72,7 @@
     return *Entry;
   }
 
-  MCSymbolData &getSymbolData(MCSymbol &Symbol) {
+  MCSymbolData &getSymbolData(const MCSymbol &Symbol) {
     MCSymbolData *&Entry = SymbolMap[&Symbol];
 
     if (!Entry)