Roll-back r250822.

Summary: It breaks the build for the ASTMatchers

Subscribers: klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D13893

llvm-svn: 250827
diff --git a/clang/lib/Driver/Tool.cpp b/clang/lib/Driver/Tool.cpp
index 6ae3506..7142e82 100644
--- a/clang/lib/Driver/Tool.cpp
+++ b/clang/lib/Driver/Tool.cpp
@@ -19,4 +19,5 @@
       ResponseSupport(_ResponseSupport), ResponseEncoding(_ResponseEncoding),
       ResponseFlag(_ResponseFlag) {}
 
-Tool::~Tool() = default;
+Tool::~Tool() {
+}