This is an awful but temporary workaround for #17615, where the case
analysis from the 'ufVeryAggressive' selector causes the entire
'DynFlags' to be unpacked into local bindings (due to binder swap). This
results in a tremendous amount of stack spillage, severely bloating the
code generated for 'callSiteInline'.

The right solution here is likely to fix binder swap to avoid this
terrible behavior (since there are likely other instances of this as
well) but this case was serious enough that it showed up in a CPU
profile and consequently

Metric Decrease:
    T1969
    T15164
    WWRec