Driver: Introduce OptSpecifier class for protecting access to an option id.

llvm-svn: 89310
diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 8242d31..a9a2d0f 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -366,7 +366,7 @@
     // Sob. These is strictly gcc compatible for the time being. Apple
     // gcc translates options twice, which means that self-expanding
     // options add duplicates.
-    switch ((options::ID) A->getOption().getId()) {
+    switch ((options::ID) A->getOption().getID()) {
     default:
       DAL->append(A);
       break;