Sema: incorrectly multiplies float vectors containing zeros at comptime

[jacobly0]

const nan = @import("std").math.nan;
comptime {
    @compileLog(nan(f32) * @as(f32, 0));
    @compileLog(@Vector(1, f32){nan(f32)} * @Vector(1, f32){0});
}

$ zig build-obj repro.zig
repro.zig:3:5: error: found compile log statement
    @compileLog(nan(f32) * @as(f32, 0));
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Compile Log Output:
@as(f32, nan)
@as(@Vector(1, f32), .{ 0 })

As an added bonus for fixing this bug, you can delete the lines in test/behavior/x86_64/math.zig referencing this issue!