stage2: error check for mixing --import-table and --export-table

is moved from the linker to the frontend. This is a follow-up from
4cb2f11693b1bf13770b8ad6a8b8a1e37101a516.
2cbeb85a96Andrew Kelley committed on 12/22/2021, 1:21:42 AMparent2e88745
3 files changedLine totals unavailable