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/ThreadLocal.cpp b/lib/System/ThreadLocal.cpp
index e7054b5..b84a8e7 100644
--- a/lib/System/ThreadLocal.cpp
+++ b/lib/System/ThreadLocal.cpp
@@ -67,6 +67,10 @@
   return pthread_getspecific(*key);
 }
 
+void ThreadLocalImpl::removeInstance() {
+  setInstance(0);
+}
+
 }
 
 #elif defined(LLVM_ON_UNIX)