Support: Move c_str from SmallVector back to SmallString and add a free standing
templated c_str in Windows.h to replace it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121381 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Windows/Windows.h b/lib/Support/Windows/Windows.h
index 12ddc92..6e0b585 100644
--- a/lib/Support/Windows/Windows.h
+++ b/lib/Support/Windows/Windows.h
@@ -102,3 +102,16 @@
 typedef ScopedHandle<HANDLE, uintptr_t(-1),
                       BOOL (WINAPI*)(HANDLE), ::FindClose>
   ScopedFindHandle;
+
+namespace llvm {
+template <class T>
+class SmallVectorImpl;
+
+template <class T>
+typename SmallVectorImpl<T>::const_pointer
+c_str(SmallVectorImpl<T> &str) {
+  str.push_back(0);
+  str.pop_back();
+  return str.data();
+}
+} // end namespace llvm.