Reducing the context stack for this file, which was looping anyway, to

make it fail sooner when we run the testsuite. Due to modifications in
rewriting we run out or context stack more slowly than before. Perhaps
something to come back to at some point.

testsuite/tests/indexed-types/should_compile/all.T

@@ -21,7 +21,7 @@ test('Simple16', normal, compile, [''])
 test('Simple17', normal, compile, [''])
 test('Simple18', normal, compile, [''])
 test('Simple19', normal, compile, [''])
-test('Simple20', expect_broken(4296), compile, [''])
+test('Simple20', expect_broken(4296), compile, ['-fcontext-stack=50'])
 test('Simple21', normal, compile, [''])
 test('Simple22', normal, compile, [''])
 test('Simple23', normal, compile, [''])