[PA]: Add loop and dominator dumping to gcc plugin

[rsulli55]

• Loop info for each function is dumped including loop number, loop body, superloops, and children
• For each basic block, dump its loopFather, the basic blocks which dominator it, as well as the nearest common dominator of its parents

[codecov[bot]]

Codecov Report

Merging #282 (4bcef4d) into master (3bb996b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #282   +/-   ##
=======================================
  Coverage   66.04%   66.04%           
=======================================
  Files          95       95           
  Lines       17892    17892           
=======================================
  Hits        11816    11816           
  Misses       6076     6076           

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[jobagy]

Trying again to review this.