Fix a recent -Wunreachable-code-aggressive regression

Bug: chromium:1066980
Change-Id: Ib7d38cb46f25b69431fa965eb6b951af3f24bc95
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3111005
Auto-Submit: Nico Weber <thakis@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76410}

src/compiler/backend/arm/instruction-selector-arm.cc

@@ -661,7 +661,6 @@ ArchOpcode GetStoreOpcode(MachineRepresentation rep) {
       return kArmStr;
     case MachineRepresentation::kSimd128:
       return kArmVst1S128;
-      break;
     case MachineRepresentation::kCompressedPointer:  // Fall through.
     case MachineRepresentation::kCompressed:         // Fall through.
     case MachineRepresentation::kWord64:             // Fall through.