API: Creation and destruction.
Creaation and destruction of MuVM, MuCtx and MuIRBuilder. Now the `mvm->new_context`, `ctx->new_ir_builder`, `ctx->close_context` and `b->abort` works. MuVM can also be created via a top-level "C"-style exported function `mu_fastimpl_new()` so that in theory, it can be used in C programs.
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