time: add Time.IsDST() to check if its Location is in Daylight Savings Time
Fixes #42102
Change-Id: I2cd2fdf67c794c3e99ed1c24786f7f779da73962
GitHub-Last-Rev:
bbfa92135734cbd55895012fa492e51686a7b58b
GitHub-Pull-Request: golang/go#42103
Reviewed-on: https://go-review.googlesource.com/c/go/+/264077
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Rob Pike <r@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>