Make liveness_contextt::get_location() public

[jezhiggins]

This accessor was inadvertently left protected, when to be remotely useful it needs to be public.

[codecov]

Codecov Report

Merging #6294 (74e4365) into develop (bec4cb6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #6294   +/-   ##
========================================
  Coverage    75.96%   75.96%           
========================================
  Files         1508     1508           
  Lines       163292   163292           
========================================
  Hits        124052   124052           
  Misses       39240    39240           

Impacted Files	Coverage Δ
...c/analyses/variable-sensitivity/liveness_context.h	100.00% <ø> (ø)

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