Coercion of [][*:0]u8 to [][*:0]const u8 in function call causes broken LLVM module

[ifreund]

Minimal reproducer:

const std = @import("std");
pub fn main() void {
    std.debug.print("{}\n", .{foo(std.os.argv)});
}
fn foo(bar: [][*:0]const u8) usize {
    return bar.len;
}

Result:

./build/zig version
0.8.0-dev.1000+3562edf13

./build/zig run /tmp/foo.zig                    
Code Generation [219/549] std.fs.path.joinSep... broken LLVM module found: Call parameter type does not match function signature!
%"[][*:0]u8"* @argv
 %"[][*:0]const u8"*  %1 = call fastcc i64 @foo(%"[][*:0]u8"* @argv), !dbg !15972

This is a bug in the Zig compiler.thread 7675 panic: 
Unable to dump stack trace: debug info stripped
zsh: abort      ./build/zig run /tmp/foo.zig

[ifreund]

Note that this works:

const std = @import("std");
pub fn main() void {
    const argv: [][*:0]const u8 = std.os.argv;
    std.debug.print("{}\n", .{foo(argv)});
}
fn foo(bar: [][*:0]const u8) usize {
    return bar.len;
}

but removing the const causes it to fail again:

const std = @import("std");
pub fn main() void {
    const argv: [][*:0]u8 = std.os.argv;
    std.debug.print("{}\n", .{foo(argv)});
}
fn foo(bar: [][*:0]const u8) usize {
    return bar.len;
}

[Vexu]

Duplicate of #4907, #4123, #6147.