Index: expose is_mutable_field

Expose isMutable via libClang and python bindings.

Patch by Jonathan B Coe!

llvm-svn: 251410
diff --git a/clang/tools/c-index-test/c-index-test.c b/clang/tools/c-index-test/c-index-test.c
index 7155d8c..26ef5f2 100644
--- a/clang/tools/c-index-test/c-index-test.c
+++ b/clang/tools/c-index-test/c-index-test.c
@@ -767,6 +767,8 @@
     clang_disposeString(DeprecatedMessage);
     clang_disposeString(UnavailableMessage);
     
+    if (clang_CXXField_isMutable(Cursor))
+      printf(" (mutable)");
     if (clang_CXXMethod_isStatic(Cursor))
       printf(" (static)");
     if (clang_CXXMethod_isVirtual(Cursor))