Fix -Wcast-qual warnings.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101779 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Archive/Archive.cpp b/lib/Archive/Archive.cpp
index f4f8a43..4f100f7 100644
--- a/lib/Archive/Archive.cpp
+++ b/lib/Archive/Archive.cpp
@@ -241,7 +241,7 @@
   // Get the module.
   std::auto_ptr<MemoryBuffer> Buffer(
     MemoryBuffer::getNewMemBuffer(Length, ModuleID.c_str()));
-  memcpy((char*)Buffer->getBufferStart(), BufPtr, Length);
+  memcpy(const_cast<char *>(Buffer->getBufferStart()), BufPtr, Length);
   
   Module *M = ParseBitcodeFile(Buffer.get(), Context, ErrMsg);
   if (!M)