Recompute density and enthalpy instead of reconstructing #7887

Job	Run time
Build SU2 (tsan) (BaseOMP-tsan)	12m 3s
Build SU2 (asan) (BaseNoMPI-asan)	16m 14s
Build SU2 (BaseMPI)	13m 25s
Build SU2 (tsan) (ReverseOMP-tsan)	28m 36s
Build SU2 (asan) (ReverseNoMPI-asan)	44m 54s
Build SU2 (ReverseMPI)	14m 37s
Build SU2 (ForwardMPI)	11m 21s
Build SU2 (BaseNoMPI)	7m 36s
Build SU2 (ReverseNoMPI)	12m 30s
Build SU2 (ForwardNoMPI)	9m 27s
Build SU2 (BaseOMP)	8m 2s
Build SU2 (ReverseOMP)	14m 58s
Build SU2 (ForwardOMP)	10m 42s
Unit Tests (test_driver)	1m 29s
Regression Tests (vandv.py)	2m 15s
Regression Tests (tutorials.py)	4m 38s
Unit Tests (test_driver_AD)	1m 2s
Unit Tests (test_driver_DD)	1m 3s
Regression Tests (parallel_regression.py)	14m 16s
Regression Tests (parallel_regression_AD.py)	8m 24s
Regression Tests (serial_regression.py)	17m 43s
Regression Tests (serial_regression_AD.py)	5m 16s
Regression Tests (hybrid_regression.py)	11m 10s
Regression Tests (hybrid_regression_AD.py)	3m 21s
Thread Sanitizer Tests (hybrid_regression.py)	21m 52s
Thread Sanitizer Tests (hybrid_regression_AD.py)	12m 14s
Address Sanitizer Tests (serial_regression.py)	13m 53s
Address Sanitizer Tests (serial_regression_AD.py)	5m 40s
	5h 28m 41s

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