Driver: Mark some Compilation members const.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74636 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Compilation.cpp b/lib/Driver/Compilation.cpp
index d7901a6..7e29b67 100644
--- a/lib/Driver/Compilation.cpp
+++ b/lib/Driver/Compilation.cpp
@@ -21,8 +21,8 @@
 #include <errno.h>
 using namespace clang::driver;
 
-Compilation::Compilation(Driver &D,
-                         ToolChain &_DefaultToolChain,
+Compilation::Compilation(const Driver &D,
+                         const ToolChain &_DefaultToolChain,
                          InputArgList *_Args) 
   : TheDriver(D), DefaultToolChain(_DefaultToolChain), Args(_Args) {
 }