Update Binaryen to b9b5f162ca8bf5b899ff0f0351491d7d403d7ed9

The new version optimizes slightly better and much faster.

Change-Id: Icbd8cd01f149c609043572bdadd42be2afd6ac54
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292301
Reviewed-by: Martin Kustermann <[email protected]>
Commit-Queue: Aske Simon Christensen <[email protected]>

Author: askeksa

DEPS

@@ -88,7 +88,7 @@ vars = {
   ### /third_party/ dependencies
 
   # Prefer to use hashes of binaryen that have been reviewed & rolled into g3.
-  "binaryen_rev" : "4471b81a0a0b94c75bad6e81d0413860944ecb1f",
+  "binaryen_rev" : "b9b5f162ca8bf5b899ff0f0351491d7d403d7ed9",
   "boringssl_gen_rev": "ced85ef0a00bbca77ce5a91261a5f2ae61b1e62f",
   "boringssl_rev": "87f316d7748268eb56f2dc147bd593254ae93198",
   "browser-compat-data_tag": "ac8cae697014da1ff7124fba33b0b4245cc6cd1b", # v1.0.22