[wasm-simd] Fix max alignment for load extends
Load extends always load 64-bits. Previously, we were setting the max alignment to be the size_log_2 of the load_type. For LoadExtends the load_type indicates what the lane size to be extended is, *NOT* the size to be loaded. Bug: chromium:1082848 Change-Id: I0c4115ea6ec916211b03afdb83376ccc05c0c244 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2202721Reviewed-by: Bill Budge <bbudge@chromium.org> Commit-Queue: Zhi An Ng <zhin@chromium.org> Cr-Commit-Position: refs/heads/master@{#67815}
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