Expose __reset for stub runtime and update allocator tests (#1045)

Author: MaxGraey

lib/loader/index.d.ts

@@ -55,6 +55,8 @@ interface ASUtil {
   __retain(ptr: number): number;
   /** Releases a previously retained reference to a managed object, allowing the runtime to collect it once its reference count reaches zero. */
   __release(ptr: number): void;
+  /** Resets base pointer to initial offset. Uses only for stub runtime. */
+  __reset?(): void;
   /** Allocates an instance of the class represented by the specified id. */
   __alloc(size: number, id: number): number;
   /** Tests whether a managed object is an instance of the class represented by the specified base id. */

std/assembly/rt/index-stub.ts

@@ -1,2 +1,2 @@
-export { __alloc, __retain, __release, __collect } from "rt/stub";
+export { __alloc, __retain, __release, __collect, __reset } from "rt/stub";
 export { __rtti_base } from "rt";

std/assembly/rt/pure.ts

@@ -260,8 +260,3 @@ export function __retain(ptr: usize): usize {
 export function __release(ptr: usize): void {
   if (ptr > __heap_base) decrement(changetype<Block>(ptr - BLOCK_OVERHEAD));
 }
-
-// @ts-ignore: decorator
-@global @unsafe
-export function __reset(): void {
-}