Eliminate false positives: BigInt

test/built-ins/BigInt/asIntN/bigint-tobigint-errors.js

test/built-ins/BigInt/asIntN/bigint-tobigint-toprimitive.js

test/built-ins/BigInt/asIntN/bits-toindex-errors.js

test/built-ins/BigInt/asIntN/bits-toindex-toprimitive.js

test/built-ins/BigInt/asUintN/bigint-tobigint-errors.js

test/built-ins/BigInt/asUintN/bigint-tobigint-toprimitive.js

test/built-ins/BigInt/asUintN/bits-toindex-errors.js

test/built-ins/BigInt/asUintN/bits-toindex-toprimitive.js

test/built-ins/BigInt/new-target-throws.js

test/built-ins/BigInt/prototype/toString/prototype-call.js

...nt/prototype/toString/thisbigintvalue-not-valid-throws.js

...Int/prototype/valueOf/this-value-invalid-object-throws.js

.../prototype/valueOf/this-value-invalid-primitive-throws.js