stage1 if expression returns wrong result or fails to compile

[peteruhnak]

Zig Version

0.10.0-dev.4197+9a2f17f9f

Steps to Reproduce

linux x86-64

pub fn main() !void {
    // works fine
    std.log.info("'{s}'", .{if (0 == 0) "yep" else "nop"});
    std.log.info("'{s}'", .{if (0 == 1) "yep" else "nop"});

    var i: i32 = 0;
    // misbehaves with variable
    std.log.info("'{s}'", .{if (i == 0) "yep" else "NOP"});
    std.log.info("'{s}'", .{if (i == 1) "yep" else "NOP"});

    // these will not compile in fstage1; works correctly in stage2
    // error: expected type '*const [3:0]u8', found '*const [4:0]u8'
    // std.log.info("'{s}'", .{if (i == 0) "yep" else "nope"});
    // std.log.info("'{s}'", .{if (i == 1) "yep" else "nope"});
}

Expected Behavior

> zig build run         
info: 'yep'
info: 'NOP'
info: 'yep'
info: 'NOP'
info: 'yep'
info: 'NOPE'

Actual Behavior

> zig build run -fstage1
info: 'yep'
info: 'NOP'
info: 'yep'
info: 'yep' // should be NOP
// compile error with the last two statements uncommented

[peteruhnak]

duplicate of #5230