[cfe-dev] fix a bug, id = 4219

[Jiandong Lu]

bug 4219 is about function clang::SourceManager::getOrCreateContentCache().It has an assertion on line 278 in file clang/lib/Basic/SourceManager.cpp modification:add this codes:" if (!File){
   return IgnorePCH;   }	  "
in function  PCHReader::ReadSLocEntryRecord() after line 808 in file clang/lib/Frontend/PCHReader.cppso that the codes are like this "case pch::SM_SLOC_FILE_ENTRY: {
    const FileEntry *File 
      = PP.getFileManager().getFile(BlobStart, BlobStart + BlobLen);
	  if (!File){
		  return IgnorePCH;  
	  }	  
    // FIXME: Error recovery if file cannot be found.
    FileID FID = SourceMgr.createFileID(File,
                                SourceLocation::getFromRawEncoding(Record[1]),
                                       (SrcMgr::CharacteristicKind)Record[2],
                                        ID, Record[0]);
    if (Record[3])
      const_cast<SrcMgr::FileInfo&>(SourceMgr.getSLocEntry(FID).getFile())
        .setHasLineDirectives();


    break;
  }"  



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