[SimpleLoopUnswitch][NFC] move quadratic asserts under EXPENSIVE_CHECKS (#144887) Three asserts/checks in SimpleLoopUnswitchPass are quite expensive on IR containing many deeply nested loop nests. Their cost is not linear with the number of loop nests and these asserts quickly become the most significant cost of the whole compilation. This patch move some of the asserts under `EXPENSIVE_CHECKS` and leaves the one line 1080 unguarded. This problem was exposed with flang because of Fortran multidimensional arrays and array expressions. In some programs, half of the end to end compilation time was spent in those asserts.
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