Integer literal promotion rules should emulate chosen compiler

[ehaas]

GCC and clang behave differently with regard to unsuffixed integer literals; see comment here ziglang/zig#19701 (comment) Note: MSVC follows the clang behavior of promoting to unsigned long long

The current behavior is implemented here:

arocc/src/aro/Parser.zig

Lines 8395 to 8402 in f60a2de

	for (specs) |spec| {
	res.ty = Type{ .specifier = spec };
	if (res.ty.compareIntegerRanks(suffix_ty, p.comp).compare(.lt)) continue;
	const max_int = res.ty.maxInt(p.comp);
	if (val <= max_int) break;
	} else {
	res.ty = .{ .specifier = .ulong_long };
	}