[turbofan] Fix typo in kMaximumReprSizeInBytes

Computation of this constant should obviously use kMaximumReprSizeLog2.
It's unclear if this could have caused observable misbehavior.

Change-Id: Iafdcbeb77d582f5f4e4aad07581377b74bb776c6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3854316Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82706}

src/codegen/machine-type.h

@@ -417,7 +417,7 @@ V8_EXPORT_PRIVATE inline constexpr int ElementSizeLog2Of(
 
 constexpr int kMaximumReprSizeLog2 =
     ElementSizeLog2Of(MachineRepresentation::kSimd128);
-constexpr int kMaximumReprSizeInBytes = 1 << kTaggedSizeLog2;
+constexpr int kMaximumReprSizeInBytes = 1 << kMaximumReprSizeLog2;
 
 static_assert(kMaximumReprSizeLog2 >=
               ElementSizeLog2Of(MachineRepresentation::kTagged));