Weaken tests about NaN canonicalization.

harness/nans.js

...nProperty/nan-equivalence-define-own-property-reassign.js

...operty/nan-equivalence-define-own-property-reconfigure.js

...uilt-ins/TypedArray/prototype/copyWithin/bit-precision.js

.../fill/fill-values-conversion-operations-consistent-nan.js

...urn-new-typedarray-conversion-operation-consistent-nan.js

test/built-ins/TypedArray/prototype/set/bit-precision.js

test/built-ins/TypedArray/prototype/slice/bit-precision.js

...s/ctors/object-arg/conversion-operation-consistent-nan.js

.../DefineOwnProperty/conversion-operation-consistent-nan.js

...tors/internals/Set/conversion-operation-consistent-nan.js

test/built-ins/isNaN/return-true-nan.js

test/harness/nans.js