move include searching logic from TGLexer to SourceMgr.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73845 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/TableGen.cpp

@@ -146,12 +146,12 @@ static bool ParseFile(const std::string &Filename,
   
   // Tell SrcMgr about this buffer, which is what TGParser will pick up.
   SrcMgr.AddNewSourceBuffer(F, SMLoc());
-  
-  TGParser Parser(SrcMgr);
 
   // Record the location of the include directory so that the lexer can find
   // it later.
-  Parser.setIncludeDirs(IncludeDirs);
+  SrcMgr.setIncludeDirs(IncludeDirs);
+  
+  TGParser Parser(SrcMgr);
 
   return Parser.ParseFile();
 }