[ruby-core:114263] [Ruby master Bug#19746] `String#index` with regexp and too large offset doesn't clear `$~`

Issue #19746 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED to 3.0: REQUIRED, 3.1: REQUIRED, 3.2: WONTFIX

I cannot confident that there's no existing application depends on the current behavior.
I don't backport the changeset.

----------------------------------------
Bug #19746: `String#index` with regexp and too large offset doesn't clear `$~`
https://bugs.ruby-lang.org/issues/19746#change-103954

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Backport: 3.0: REQUIRED, 3.1: REQUIRED, 3.2: WONTFIX
----------------------------------------
```ruby
/./ =~ "a"
p "x".index(/0/, 4) #=> nil
p $~ #=> #<MatchData "a">
```

while `rindex` does.

```ruby
/./ =~ "a"
p "x".rindex(/0/, 4) #=> nil
p $~ #=> nil
```

It seems since 1.9.




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