Add an erase() method to llvm::ThreadLocal.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109686 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/ThreadLocal.inc b/lib/System/Win32/ThreadLocal.inc
index c8f7840..b8b933c 100644
--- a/lib/System/Win32/ThreadLocal.inc
+++ b/lib/System/Win32/ThreadLocal.inc
@@ -46,4 +46,8 @@
   assert(errorcode != 0);
 }
 
+void ThreadLocalImpl::removeInstance() {
+  setInstance(0);
+}
+
 }