Compiler crash when using array repetition in comptime unrolled loop

[tgschultz]

const warn = @import("std").debug.warn;

test "array repetition in comptime unrolled loop" {
    comptime var i = 0;
    inline while(i < 2) : (i += 1) {
        const str = "str|"**i;
    }
}

Probably related to #740

[andrewrk]

This is actually the same problem as #740. See the explanation there. I'll leave this open just in case and we'll have both test cases in the test suite once this problem is fixed.