crypto/subtle: note that input length mismatch makes ConstantTimeCompare return immediately
crypto/subtle: note that input length mismatch makes ConstantTimeCompare return immediately

Change-Id: Id1ae6c8fbb8c2f31b251ba141dc2bbedae189006
Reviewed-on: https://go-review.googlesource.com/c/go/+/316169
Trust: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
Reviewed-by: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
Trust: Johan Brandhorst-Satzkorn <8c98250619a5229afaab52d25e022b9e3e1d22a2@gmail.com>

nawawi/go,CAFxX/go,golang/go,golang/go,CAFxX/go,golang/go,nawawi/go,CAFxX/go,golang/go,nawawi/go,CAFxX/go,nawawi/go,nawawi/go,CAFxX/go,golang/go,nawawi/go,golang/go,nawawi/go,CAFxX/go,golang/go,nawawi/go,golang/go,CAFxX/go,CAFxX/go