stage2: make use of `llvm.Context` in LLVM backend

This for example allows for multiple LLVM instances to run in parallel.

Also rename some functions in llvm_bindings.zig.

Fixes #7688
31d1ec4c2fTimon Kruiper committed on 1/6/2021, 9:52:20 AMparent5d5db83
2 files changedLine totals unavailable