Fix asm2wasm dead lock caused by empty modules.

This commit fixes an asm2wasm dead lock when asm2wasm is compiling an
empty module, i.e. a module without any functions.

Without this commit, worker threads are likely to leave `workerMain()`
and decrease `liveWorkers` early.  Consequently, `waitUntilAllReady()`
will never observe `liveWorkers == numWorkers`.

1 files changed, 4 insertions, 0 deletions

diff --git a/test/empty.asm.js b/test/empty.asm.js
new file mode 100644
index 000000000..94fa6bb38
--- /dev/null
+++ b/test/empty.asm.js
@@ -0,0 +1,4 @@
+function EmptyModule() {
+    'use asm';
+    return {};
+}