Rename TGSourceMgr -> SourceMgr.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73844 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/TGLexer.cpp b/utils/TableGen/TGLexer.cpp
index 2f619e4..578930c 100644
--- a/utils/TableGen/TGLexer.cpp
+++ b/utils/TableGen/TGLexer.cpp
@@ -24,7 +24,7 @@
 #include <cerrno>
 using namespace llvm;
 
-TGLexer::TGLexer(TGSourceMgr &SM) : SrcMgr(SM) {
+TGLexer::TGLexer(SourceMgr &SM) : SrcMgr(SM) {
   CurBuffer = 0;
   CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
   CurPtr = CurBuf->getBufferStart();