move IdentifierTable.h from liblex to libbasic.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42730 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/AST/Expr.cpp b/AST/Expr.cpp
index 40a95c0..ac8df82 100644
--- a/AST/Expr.cpp
+++ b/AST/Expr.cpp
@@ -14,7 +14,7 @@
 #include "clang/AST/Expr.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/StmtVisitor.h"
-#include "clang/Lex/IdentifierTable.h"
+#include "clang/Basic/IdentifierTable.h"
 using namespace clang;
 
 //===----------------------------------------------------------------------===//