MIPS64: Fix [KeyedLoadIC] Support Smi "handlers" for element loads
Fix 2cf2eef7 Fix test failures with tests working on external Uint32 arrays. Problem started to appear because Uint32 value was compared using Int32 compare operators in ChangeUint32ToTagged. On MIPS64. Uint32 value is not sign- extended, so upper 32 bits of this value are zero. MIPS64 doesn't have Word32Compare instructions but uses Word64Compare instructions in combination with properly sign-extended Int32 values. BUG=cctest/test-api/Uint32Array,cctest/test-api/SharedUint32Array, cctest/test-api/FixedUint32Array,mjsunit/compiler/uint32 Review-Url: https://codereview.chromium.org/2231053002 Cr-Commit-Position: refs/heads/master@{#38680}
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