[runtime] Only apply the maverick stack size hack added by d6673ca8ec854f291eb32c048446b3868b92de7a to the main thread since some system threads might really have a small stack size, causing us to overestimate their stack size. This can cause us to mprotect () random memory in mono_setup_altstack (), cause random crashes. Hopefully fixes #10096.
[mcs] Handling CreateStandardLiftedOperatorsTable for corlib without nullable type