[roll] Roll fuchsia [forma] SIMD lib cleanup.

Removes an unused method from AVX and brings WASM32 up to date.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/678345
Original-Revision: 7d3450ee830731e1bee309759e85107fb559b869
GitOrigin-RevId: fc3812d737367652d6c6c2d2e3287ffc1b7c727c
Change-Id: Iba37d7f3e692f39307f1897da1dbe9fab1bc2f42
diff --git a/stem b/stem
index 43898f7..889b8bb 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
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              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="a5725d5bb7975b97dc70ec7a378fd3474a686848"/>
+             revision="7d3450ee830731e1bee309759e85107fb559b869"/>
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   <hooks>
     <hook name="install-environment"