RFR: 8178355: IdentityHashMap uses identity-based comparison for values everywhere except remove(K,V) and replace(K,V,V)

[ExE Boss]

On Fri, 15 Apr 2022 05:58:32 GMT, liach <duke at openjdk.java.net> wrote:

> Explicitly implement `remove` and `replace` in `IdentityHashMap` to compare values by identity. Updated API documentation of these two methods ([Preview](https://cr.openjdk.java.net/~liach/8178355/IdentityHashMap.html#remove(java.lang.Object,java.lang.Object))) to mention such behavior.

test/jdk/java/util/IdentityHashMap/DefaultRemoveReplace.java line 36:

> 34:         final String key = "key";
> 35:         final String internedValue = "value";
> 36:         final String constructedValue = new String(new char[]{'v', 'a', 'l', 'u', 'e'});

Using:
Suggestion:

        final String constructedValue = new String(internedValue);

will allow the internal `String.value` array to be shared: <https://github.com/openjdk/jdk/blob/bdf8a2a2050393e91800786f8d5a5d6805f936eb/src/java.base/share/classes/java/lang/String.java#L259-L265>

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PR: https://git.openjdk.java.net/jdk/pull/8259