Add const. NFC.

This adds const to a few methods that already return const references or
creates a const version when they reterun non-const references.

llvm-svn: 221666

llvm/include/llvm/MC/MCParser/MCAsmLexer.h

@@ -157,7 +157,7 @@ public:
   SMLoc getLoc() const;
 
   /// Get the current (last) lexed token.
-  const AsmToken &getTok() {
+  const AsmToken &getTok() const {
     return CurTok;
   }
 

llvm/include/llvm/MC/MCParser/MCAsmParser.h

@@ -87,6 +87,9 @@ public:
   virtual SourceMgr &getSourceManager() = 0;
 
   virtual MCAsmLexer &getLexer() = 0;
+  const MCAsmLexer &getLexer() const {
+    return const_cast<MCAsmParser*>(this)->getLexer();
+  }
 
   virtual MCContext &getContext() = 0;
 
@@ -138,7 +141,7 @@ public:
   virtual const AsmToken &Lex() = 0;
 
   /// Get the current AsmToken from the stream.
-  const AsmToken &getTok();
+  const AsmToken &getTok() const;
 
   /// \brief Report an error at the current lexer location.
   bool TokError(const Twine &Msg, ArrayRef<SMRange> Ranges = None);

llvm/include/llvm/MC/MCParser/MCAsmParserExtension.h

@@ -52,8 +52,17 @@ public:
   /// @{
 
   MCContext &getContext() { return getParser().getContext(); }
+
   MCAsmLexer &getLexer() { return getParser().getLexer(); }
+  const MCAsmLexer &getLexer() const {
+    return const_cast<MCAsmParserExtension *>(this)->getLexer();
+  }
+
   MCAsmParser &getParser() { return *Parser; }
+  const MCAsmParser &getParser() const {
+    return const_cast<MCAsmParserExtension*>(this)->getParser();
+  }
+
   SourceMgr &getSourceManager() { return getParser().getSourceManager(); }
   MCStreamer &getStreamer() { return getParser().getStreamer(); }
   bool Warning(SMLoc L, const Twine &Msg) {

llvm/lib/MC/MCParser/MCAsmParser.cpp

@@ -29,7 +29,7 @@ void MCAsmParser::setTargetParser(MCTargetAsmParser &P) {
   TargetParser->Initialize(*this);
 }
 
-const AsmToken &MCAsmParser::getTok() {
+const AsmToken &MCAsmParser::getTok() const {
   return getLexer().getTok();
 }