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fix broken code and examples

--- a/cmd/tblgen/crctbl.ha

+++ b/cmd/tblgen/crctbl.ha

@@ -26,33 +26,24 @@

 // uint16_t upper = 0;

 //

 // for (uint32_t i = 0; i < sizeof(p) / sizeof(unsigned char); ++i) {

-//   poly |= 1UL << (15 - p[i]);

+//   poly |= 1UL << (31 - p[i]);

 // }

 //

-// lower = poly & ((1U << 16) - 1);

-// upper = poly >> 16;

-// poly = (lower << 16) | upper;

 use fmt;

 export fn main() void = {

-//	let poly: u32 = 0;

-//	let lower: u32 = 0;

-//	let upper: u32 = 0;

-//

-//	const p: []u32 = [ 0, 1, 2, 4, 5, 7, 8, 10, 11, 12, 16, 22, 23, 26 ];

-//

-//	for (let i = 0z; i < len(p); i += 1) {

-//		poly |= (1: u32) << (15 - p[i]);

-//	};

-//

-//	lower = poly & ((1 << 16) - 1);

-//	upper = poly >> 16;

-//	poly = (lower << 16) | upper;

-//

-//	assert(poly == 0xedb88320);

+	let poly: u32 = 0;

+	let lower: u32 = 0;

+	let upper: u32 = 0;

-	const poly: u32 = 0xedb88320;

+	const p: []u32 = [ 0, 1, 2, 4, 5, 7, 8, 10, 11, 12, 16, 22, 23, 26 ];

+

+	for (let i = 0z; i < len(p); i += 1) {

+		poly |= (1: u32) << (31 - p[i]);

+	};

+

+	assert(poly == 0xedb88320);

 	let t: [256]u32 = [0...];