Fix calling time.now() in wasm js runtime

vendor/wasm/js/runtime.js

@@ -1334,14 +1334,9 @@ function odinSetupDefaultImports(wasmMemoryInterface, consoleElement) {
 			abort: () => { Module.abort() },
 			evaluate: (str_ptr, str_len) => { eval.call(null, wasmMemoryInterface.loadString(str_ptr, str_len)); },
 
-			time_now: () => {
-				// convert ms to ns
-				return Date.now() * 1e6;
-			},
-			tick_now: () => {
-				// convert ms to ns
-				return performance.now() * 1e6;
-			},
+			// return a bigint to be converted to i64
+			time_now: () => BigInt(Date.now()),
+			tick_now: () => BigInt(performance.now()),
 			time_sleep: (duration_ms) => {
 				if (duration_ms > 0) {
 					// TODO(bill): Does this even make any sense?