Recompute density and enthalpy instead of reconstructing #7926

Job	Run time
Build SU2 (tsan) (BaseOMP-tsan)	11m 27s
Build SU2 (tsan) (ReverseOMP-tsan)	28m 40s
Build SU2 (BaseMPI)	12m 58s
Build SU2 (ReverseMPI)	13m 54s
Build SU2 (ForwardMPI)	11m 7s
Build SU2 (BaseNoMPI)	8m 12s
Build SU2 (ReverseNoMPI)	4m 52s
Build SU2 (ForwardNoMPI)	9m 34s
Build SU2 (BaseOMP)	7m 30s
Build SU2 (ReverseOMP)	14m 42s
Build SU2 (ForwardOMP)	10m 24s
Build SU2 (asan) (BaseNoMPI-asan)	15m 57s
Build SU2 (asan) (ReverseNoMPI-asan)	44m 10s
Regression Tests	0s
Unit Tests	0s
Thread Sanitizer Tests (hybrid_regression.py)	1m 24s
Thread Sanitizer Tests (hybrid_regression_AD.py)	1m 5s
Address Sanitizer Tests (serial_regression.py)	1m 6s
Address Sanitizer Tests (serial_regression_AD.py)	1m 30s
	3h 18m 32s

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