Add an assert to check copy_to_buffer's precondition.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78926 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index 5eaf7bf..3ea5c9a 100644
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -222,6 +222,8 @@
 }
 
 void raw_ostream::copy_to_buffer(const char *Ptr, size_t Size) {
+  assert(Size <= OutBufEnd - OutBufCur && "Buffer overrun!");
+
   // Handle short strings specially, memcpy isn't very good at very short
   // strings.
   switch (Size) {