Fix a couple of infix:<xx> spec test failures after GLR
Fix a couple of infix:<xx> spec test failures after GLR

Tests assume flattening semantics that are no longer there.
Need to explicitly ask for flattening now.

perl6/roast,b2gills/roast,dankogai/roast,zostay/roast,cygx/roast,zostay/roast,skids/roast,dogbert17/roast,skids/roast,dankogai/roast,skids/roast,zostay/roast,bitrauser/roast,b2gills/roast,dankogai/roast,dogbert17/roast,cygx/roast,bitrauser/roast,b2gills/roast,cygx/roast