fix crash on functions missing a gprof call graph entry

[nvxbug]

gprof can list a function that its static call graph analysis discovered but that never got its own call graph entry. When GprofParser.parse meets one of those as a child it builds a placeholder Function, but writes the self time and call count onto the caller (function[TIME], function.called) instead of the placeholder, so the caller's real numbers are wiped and the placeholder goes in with no TIME event. profile.ratio(TIME_RATIO, TIME) then trips its assert on that placeholder and the whole run dies; AXEParser.parse holds a copy of the same code with the same misassignment.

Point both assignments at the placeholder (missing) so it carries the events it needs and the caller keeps its own. AXE functions also hold a total-time ratio, so the placeholder there gets TOTAL_TIME_RATIO too, which the later call-weight pass reads. The branch only runs for functions with no entry, so profiles that never reach it come out unchanged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.34%. Comparing base (5cbab29) to head (00ebcd4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
+ Coverage   86.03%   86.34%   +0.30%     
==========================================
  Files           1        1              
  Lines        2342     2343       +1     
==========================================
+ Hits         2015     2023       +8     
+ Misses        327      320       -7     

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[nvxbug]

any update?