When querying for callees against a static call, the entire SSA
form for the program was built. Since we can tell if a callee is
statically dispatched after typechecking, try to do that before
building the SSA form.
This cuts 3.5 seconds off queries against static calls.
Change-Id: I22291381d3bec490e3b1d6f9c6b5a0092fd9f635
Reviewed-on: https://go-review.googlesource.com/10230
Reviewed-by: Alan Donovan <adonovan@google.com>
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