refactor: store mm in TearingState

[AayushSabharwal]

This avoids the mm being stale by the time it gets to reassembly.

[AayushSabharwal]

Somehow none of the assertion failures reproduce locally

[github-actions]

Benchmark Results (Julia vlts)

Time benchmarks

	master	a0f2812...	master / a0f2812...
ODEProblem	13.7 ± 6.1 ms	9.59 ± 0.99 ms	1.43 ± 0.65
init	0.105 ± 0.035 ms	0.0933 ± 0.027 ms	1.13 ± 0.49
large_parameter_init/ODEProblem	0.0516 ± 0.016 s	0.0377 ± 0.0056 s	1.37 ± 0.48
large_parameter_init/init	0.112 ± 0.016 ms	0.101 ± 0.024 ms	1.11 ± 0.31
mtkcompile	18.6 ± 7.8 ms	13.5 ± 0.79 ms	1.38 ± 0.58
sparse_analytical_jacobian/ODEProblem	0.048 ± 0.016 s	0.0336 ± 0.0023 s	1.43 ± 0.49
sparse_analytical_jacobian/f_iip	0.07 ± 0.01 μs	0.07 ± 0.01 μs	1 ± 0.2
sparse_analytical_jacobian/f_oop	0.375 ± 0.27 ms	0.362 ± 0.0073 ms	1.03 ± 0.74
time_to_load	7.66 ± 0.59 s	6.35 ± 0.19 s	1.21 ± 0.1

Memory benchmarks

	master	a0f2812...	master / a0f2812...
ODEProblem	31.5 k allocs: 1.93 MB	31.5 k allocs: 1.93 MB	1
init	0.416 k allocs: 0.0697 MB	0.416 k allocs: 0.0697 MB	1
large_parameter_init/ODEProblem	0.316 M allocs: 11.5 MB	0.317 M allocs: 11.5 MB	1
large_parameter_init/init	0.604 k allocs: 0.172 MB	0.604 k allocs: 0.172 MB	1
mtkcompile	0.0597 M allocs: 3.45 MB	0.0583 M allocs: 3.39 MB	1.02
sparse_analytical_jacobian/ODEProblem	0.196 M allocs: 8.31 MB	0.196 M allocs: 8.31 MB	1
sparse_analytical_jacobian/f_iip	0 allocs: 0 B	0 allocs: 0 B
sparse_analytical_jacobian/f_oop	0.634 k allocs: 19.6 kB	0.634 k allocs: 19.6 kB	1
time_to_load	0.153 k allocs: 14.6 kB	0.153 k allocs: 14.6 kB	1

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	master	ac70079...	master / ac70079...
ODEProblem	8.68 ± 1.4 ms	9.87 ± 0.72 ms	0.88 ± 0.16
init	0.08 ± 0.0088 ms	0.0819 ± 0.0097 ms	0.977 ± 0.16
large_parameter_init/ODEProblem	0.0435 ± 0.0048 s	0.0442 ± 0.004 s	0.985 ± 0.14
large_parameter_init/init	0.0964 ± 0.039 ms	0.0992 ± 0.031 ms	0.972 ± 0.5
mtkcompile	12.7 ± 1.5 ms	13.6 ± 0.75 ms	0.936 ± 0.12
sparse_analytical_jacobian/ODEProblem	0.0369 ± 0.003 s	0.034 ± 0.0013 s	1.08 ± 0.098
sparse_analytical_jacobian/f_iip	0.08 ± 0.01 μs	0.08 ± 0 μs	1 ± 0.12
sparse_analytical_jacobian/f_oop	0.117 ± 0.014 ms	0.118 ± 0.012 ms	0.99 ± 0.15
time_to_load	5.87 ± 0.41 s	6.86 ± 0.69 s	0.856 ± 0.11

Memory benchmarks

	master	ac70079...	master / ac70079...
ODEProblem	30.1 k allocs: 1.75 MB	30.1 k allocs: 1.77 MB	0.991
init	0.415 k allocs: 0.0517 MB	0.415 k allocs: 0.0517 MB	1
large_parameter_init/ODEProblem	0.329 M allocs: 12.5 MB	0.329 M allocs: 12.5 MB	1
large_parameter_init/init	0.798 k allocs: 0.151 MB	0.798 k allocs: 0.151 MB	1
mtkcompile	0.0561 M allocs: 2.75 MB	0.0547 M allocs: 2.7 MB	1.02
sparse_analytical_jacobian/ODEProblem	0.189 M allocs: 7.28 MB	0.189 M allocs: 7.28 MB	1
sparse_analytical_jacobian/f_iip	0 allocs: 0 B	0 allocs: 0 B
sparse_analytical_jacobian/f_oop	0.848 k allocs: 27 kB	0.848 k allocs: 27 kB	1
time_to_load	0.146 k allocs: 11.4 kB	0.146 k allocs: 11.4 kB	1