planner: check index valid while forUpdateRead (#22152)#22365

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ti-srebot wants to merge 1 commit intopingcap:release-5.0-rcfrom ti-srebot:release-5.0-rc-4088c2011ba7

+296-9

Commits on Jan 12, 2021

cherry pick pingcap#22152 to release-5.0-rc

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