[LLParser] Remove outdated deplibs

[TH3CHARLie]

Summary

The comment dated 9 years ago mentions deplibs should be removed in 4.0. Removing it in this patch.

[TH3CHARLie]

Update diff

llvm/include/llvm/AsmParser/LLParser.h

private:
     // Top-Level Entities
     bool parseTopLevelEntities();
     bool validateEndOfModule(bool UpgradeDebugInfo);
     bool validateEndOfIndex();
     bool parseTargetDefinitions();
     bool parseTargetDefinition();
     bool parseModuleAsm();
     bool parseSourceFileName();
-    bool parseDepLibs(); // FIXME: Remove in 4.0.
     bool parseUnnamedType();
     bool parseNamedType();
     bool parseDeclare();
     bool parseDefine();
 
     bool parseGlobalType(bool &IsConstant);
     bool parseUnnamedGlobal();
     bool parseNamedGlobal();

llvm/lib/AsmParser/LLLexer.cpp

#define KEYWORD(STR)                                                           \
   KEYWORD(from);
   KEYWORD(tail);
   KEYWORD(musttail);
   KEYWORD(notail);
   KEYWORD(target);
   KEYWORD(triple);
   KEYWORD(source_filename);
   KEYWORD(unwind);
-  KEYWORD(deplibs);             // FIXME: Remove in 4.0.
   KEYWORD(datalayout);
   KEYWORD(volatile);
   KEYWORD(atomic);
   KEYWORD(unordered);
   KEYWORD(monotonic);
   KEYWORD(acquire);
   KEYWORD(release);
   KEYWORD(acq_rel);

llvm/lib/AsmParser/LLParser.cpp

while (true) {
     case lltok::kw_define:
       if (parseDefine())
         return true;
       break;
     case lltok::kw_module:
       if (parseModuleAsm())
         return true;
       break;
-    case lltok::kw_deplibs:
-      if (parseDepLibs())
-        return true;
-      break;
     case lltok::LocalVarID:
       if (parseUnnamedType())
         return true;
       break;
     case lltok::LocalVar:
       if (parseNamedType())
         return true;
       break;
bool LLParser::parseSourceFileName() {
   if (parseToken(lltok::equal, "expected '=' after source_filename") ||
       parseStringConstant(SourceFileName))
     return true;
   if (M)
     M->setSourceFileName(SourceFileName);
   return false;
 }
 
-/// toplevelentity
-///   ::= 'deplibs' '=' '[' ']'
-///   ::= 'deplibs' '=' '[' STRINGCONSTANT (',' STRINGCONSTANT)* ']'
-/// FIXME: Remove in 4.0. Currently parse, but ignore.
-bool LLParser::parseDepLibs() {
-  assert(Lex.getKind() == lltok::kw_deplibs);
-  Lex.Lex();
-  if (parseToken(lltok::equal, "expected '=' after deplibs") ||
-      parseToken(lltok::lsquare, "expected '=' after deplibs"))
-    return true;
-
-  if (EatIfPresent(lltok::rsquare))
-    return false;
-
-  do {
-    std::string Str;
-    if (parseStringConstant(Str))
-      return true;
-  } while (EatIfPresent(lltok::comma));
-
-  return parseToken(lltok::rsquare, "expected ']' at end of list");
-}
-
 /// parseUnnamedType:
 ///   ::= LocalVarID '=' 'type' type
 bool LLParser::parseUnnamedType() {
   LocTy TypeLoc = Lex.getLoc();
   unsigned TypeID = Lex.getUIntVal();
   Lex.Lex(); // eat LocalVarID;
 
   if (parseToken(lltok::equal, "expected '=' after name") ||