arc optimizations (#13325)

* scope based destructors
* handle 'or' and 'and' expressions properly, see the new test arc/tcontrolflow.nim
* make this branch mergable, logic is disabled for now
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Andreas Rumpf 2020-03-18 16:57:34 +01:00 • committed by GitHub
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@ -2,7 +2,7 @@ discard """
valgrind: true
cmd: '''nim c -d:nimAllocStats --newruntime $file'''
output: '''OK 3
(allocCount: 8, deallocCount: 3)'''
(allocCount: 8, deallocCount: 5)'''
"""
import strutils, math