Update binaryen to latest nightly; Source map support

std/assembly/allocator/arena.ts

@@ -0,0 +1,34 @@
+/////////////// A simple yet effective Arena Memory Allocator /////////////////
+
+// Provides a `reset_memory` function to reset the heap to its initial state. A
+// user has to make sure that there are no more references to cleared memory
+// afterwards. Always aligns to 8 bytes.
+
+const ALIGN_LOG2: usize = 3;
+const ALIGN_SIZE: usize = 1 << ALIGN_LOG2;
+const ALIGN_MASK: usize = ALIGN_SIZE - 1;
+
+var HEAP_OFFSET: usize = HEAP_BASE;
+
+export function allocate_memory(size: usize): usize {
+  if (!size) return 0;
+  var ptr = HEAP_OFFSET;
+  var off = (ptr + size + ALIGN_MASK) & ~ALIGN_MASK;
+  var avail = <usize>current_memory() << 16;
+  if (off > avail && grow_memory(
+    max(
+      (((off + 0xffff) & ~0xffff) - avail) >> 16, // minimum required pages
+      avail                                >> 16  // at least double memory
+    )
+  ) < 0) unreachable(); // out of memory
+  HEAP_OFFSET = off;
+  return ptr;
+}
+
+export function free_memory(ptr: usize): void {
+  // nop
+}
+
+export function reset_memory(): void {
+  HEAP_OFFSET = HEAP_BASE;
+}

std/assembly/allocator/tlsf.ts

@@ -0,0 +1,10 @@
+// Re-export for now, so there's just one source file being worked on
+
+export {
+  allocate_memory,
+  free_memory
+} from "../../../examples/tlsf/assembly/tlsf";
+
+export function reset_memory(): void {
+  throw new Error("not supported");
+}