[MC/DC] Update CoverageMapping tests
To resolve the error, rename mcdc-error-nests.cpp -> mcdc-nested-expr.cpp at first.
- `func_condop`
A corner case that contains close decisions.
- `func_expect`
Uses `__builtin_expect`. (#124565)
- `func_lnot`
Contains logical not(s) `!` among MC/DC binary operators. (#124563)
mcdc-single-cond.cpp is for #95336.