Revert "[ThinLTO] Serialize the Module SourceFileName to/from LLVM assembly"

This reverts commit r264869. I am seeing Windows bot failures due to the
"\" in the path being mishandled at some point (seems to be interpreted
wrongly at some point and llvm-as | llvm-dis is yielding some junk
characters). Need to investigate.

llvm-svn: 264871

lib/AsmParser/LLLexer.cpp

@@ -533,7 +533,6 @@ lltok::Kind LLLexer::LexIdentifier() {
   KEYWORD(notail);
   KEYWORD(target);
   KEYWORD(triple);
-  KEYWORD(source_filename);
   KEYWORD(unwind);
   KEYWORD(deplibs);             // FIXME: Remove in 4.0.
   KEYWORD(datalayout);

lib/AsmParser/LLParser.cpp

@@ -239,10 +239,6 @@ bool LLParser::ParseTopLevelEntities() {
     case lltok::kw_define:  if (ParseDefine()) return true; break;
     case lltok::kw_module:  if (ParseModuleAsm()) return true; break;
     case lltok::kw_target:  if (ParseTargetDefinition()) return true; break;
-    case lltok::kw_source_filename:
-      if (ParseSourceFileName())
-        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;
@@ -339,19 +335,6 @@ bool LLParser::ParseTargetDefinition() {
   }
 }
 
-/// toplevelentity
-///   ::= 'source_filename' '=' STRINGCONSTANT
-bool LLParser::ParseSourceFileName() {
-  assert(Lex.getKind() == lltok::kw_source_filename);
-  std::string Str;
-  Lex.Lex();
-  if (ParseToken(lltok::equal, "expected '=' after source_filename") ||
-      ParseStringConstant(Str))
-    return true;
-  M->setSourceFileName(Str);
-  return false;
-}
-
 /// toplevelentity
 ///   ::= 'deplibs' '=' '[' ']'
 ///   ::= 'deplibs' '=' '[' STRINGCONSTANT (',' STRINGCONSTANT)* ']'

lib/AsmParser/LLParser.h

@@ -261,7 +261,6 @@ namespace llvm {
     bool ValidateEndOfModule();
     bool ParseTargetDefinition();
     bool ParseModuleAsm();
-    bool ParseSourceFileName();
     bool ParseDepLibs();        // FIXME: Remove in 4.0.
     bool ParseUnnamedType();
     bool ParseNamedType();

lib/AsmParser/LLToken.h

@@ -59,7 +59,6 @@ namespace lltok {
     kw_notail,
     kw_target,
     kw_triple,
-    kw_source_filename,
     kw_unwind,
     kw_deplibs,                 // FIXME: Remove in 4.0
     kw_datalayout,

lib/IR/AsmWriter.cpp

@@ -2215,9 +2215,6 @@ void AssemblyWriter::printModule(const Module *M) {
       M->getModuleIdentifier().find('\n') == std::string::npos)
     Out << "; ModuleID = '" << M->getModuleIdentifier() << "'\n";
 
-  if (!M->getSourceFileName().empty())
-    Out << "source_filename = \"" << M->getSourceFileName() << "\"\n";
-
   const std::string &DL = M->getDataLayoutStr();
   if (!DL.empty())
     Out << "target datalayout = \"" << DL << "\"\n";

test/Assembler/source-filename.ll

@@ -1,8 +0,0 @@
-
-; Make sure that llvm-as/llvm-dis properly assemble/disassemble the
-; source_filename.
-
-; RUN: llvm-as < %s | llvm-dis | FileCheck %s
-
-; CHECK: source_filename = "test.cc"
-source_filename = "test.cc"