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d3ebd42865
This commit makes it possible to obtain pointers to `extern` variables at comptime. - `ir_get_var_ptr` employs several checks to determine if the given variable is eligible for obtaining its pointer at comptime. This commit alters these checks to consider `extern` variables, which have runtime values, as eligible. - After this change, it's now possible for `render_const_val` to be called for `extern` variables. This commit modifies `render_const_val` to suppress the value generation for `extern` variables. - `do_code_gen` now creates `ZigValue::llvm_global` of `extern` variables before iterating through module-level variables so that other module-level variables can refer to them. This solution is incomplete since there are several cases still failing: - `global_var.array[n..m]` - `&global_var.array[i]` - `&global_var.inner_struct.value` - `&global_array[i]` Closes #5349