profile format=:flat has wrong overhead

[vtjnash]

for example, I made this profile:

Profile.print(C=true,format=:flat,sortedby=:overhead)

    17         1 /Users/jameson/julia1/src/subtype.c                                                                                                    343 obviously_egal
     8         1 /Users/jameson/julia1/src/subtype.c                                                                                                    770 var_gt
     4         1 /Users/jameson/julia1/src/subtype.c                                                                                                    646 subtype_ccheck
     9         1 /Users/jameson/julia1/src/subtype.c                                                                                                   1451 subtype
     8         1 /Users/jameson/julia1/src/jltypes.c                                                                                                    533 flatten_type_union
   206         2 /usr/lib/system/libsystem_malloc.dylib                                                                                                   ? _nanov2_free
     5         2 /Users/jameson/julia1/src/jltypes.c                                                                                                    826 simple_intersect
   213         3 /usr/lib/system/libsystem_malloc.dylib                                                                                                   ? nanov2_malloc
    19         3 /usr/lib/system/libsystem_malloc.dylib                                                                                                   ? free
    13         3 /usr/lib/system/libsystem_malloc.dylib                                                                                                   ? _malloc_zone_malloc
    14         3 /Users/jameson/julia1/src/subtype.c                                                                                                    981 subtype_unionall
     3         3 /usr/lib/system/libsystem_malloc.dylib                                                                                                   ? malloc
     8         5 /Users/jameson/julia1/src/jltypes.c                                                                                                   1483 jl_unwrap_unionall
    11         5 /usr/lib/system/libsystem_kernel.dylib                                                                                                   ? __error
   108         6 /Users/jameson/julia1/src/jltypes.c                                                                                                    154 has_free_typevars
    23         6 /Users/jameson/julia1/src/subtype.c                                                                                                   1546 local_forall_exists_subtype
    21        14 /usr/lib/system/libsystem_pthread.dylib                                                                                                  ? pthread_getspecific
    26        26 /usr/lib/system/libsystem_platform.dylib                                                                                                 ? [unknown function]
    32        32 /Users/jameson/julia1/usr/lib/libjulia-internal.1.10.dylib                                                                               ? [unknown function]
   118       118 /usr/lib/system/libsystem_platform.dylib                                                                                                 ? _platform_memmove$VARIANT$Haswell
   189       189 /usr/lib/system/libsystem_platform.dylib                                                                                                 ? _platform_bzero$VARIANT$Haswell
  6271      6271 /Users/jameson/julia1/src/jlapi.c                                                                                                      734 jl_repl_entrypoint

Gabriel noted that is has attributed overhead to the root node, instead of the leaf node, so it might be processing this counter in the wrong direction now