[libclang] Bring CXCursor_AsmStmt back as an alias for CXCursor_GCCAsmStmt.

This was renamed in r162632 which was badness because the C API needs to be stable.
rdar://12360096

llvm-svn: 164547
diff --git a/clang/include/clang-c/Index.h b/clang/include/clang-c/Index.h
index 1280fb3..8055535 100644
--- a/clang/include/clang-c/Index.h
+++ b/clang/include/clang-c/Index.h
@@ -1907,6 +1907,7 @@
   /** \brief A GCC inline assembly statement extension.
    */
   CXCursor_GCCAsmStmt                    = 215,
+  CXCursor_AsmStmt                       = CXCursor_GCCAsmStmt,
 
   /** \brief Objective-C's overall \@try-\@catch-\@finally statement.
    */