util: remove unreachable defensive coding
Now that we are using primordials in the first part of isIdenticalTypedArrayType(), the defensive coding to get the correct result (when Symbol.toStringTag is manipulated) is no longer reachable or necessary. Remove the code.
Refs: https://coverage.nodejs.org/coverage-873d21cdc1266273/lib/internal/util/comparisons.js.html#L135
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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