evented IO in noreturn function causes generation of broken LLVM module

const std = @import("std");
pub const io_mode: std.io.Mode = .evented;

fn bleh() noreturn {
    std.io.getStdOut().writer().writeAll("x") catch {};
    unreachable;
}

pub fn main() !void {
    bleh();
}

produces the following output from the compiler:

broken LLVM module found: Basic Block in function 'main' does not have terminator!
label %OkResume

This is a bug in the Zig compiler.
Unable to dump stack trace: debug info stripped

related:

const std = @import("std");
pub const io_mode: std.io.Mode = .evented;

pub fn panic(msg: []const u8,trace: ?*std.builtin.StackTrace) noreturn {
    std.io.getStdOut().writer().writeAll("x") catch {};
    unreachable;
}

pub fn main() !void {
}

produces:

broken LLVM module found: Call parameter type does not match function signature!
%"[]u8"* @76
 %"@Frame(panic)"*  call fastcc void @panic(%"[]u8"* @76, %std.builtin.StackTrace* null), !dbg !2220
Call parameter type does not match function signature!
(...)

[mb64]

I just ran into this without using the stdlib, so it might be useful as a simpler repro:

fn loop() callconv(.Async) noreturn {
    while (true) {}
}
fn suspend_first() noreturn {
    suspend;
    loop();
}

test "suspend_first" {
    const frame = async suspend_first();
}

Causes:

broken LLVM module found: Basic Block in function 'suspend_first' does not have terminator!
label %OkResume