RFR: 8253037: G1: Improve check for string dedup

[Kim Barrett]

On Sun, 1 Nov 2020 09:40:03 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Nit: maybe mentioning `java_string` in the method name could make the precondition more explicit, sth like `enqueue_java_string_from_evacuation`.

That seems redundant, since this function is in StringDedup.

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PR: https://git.openjdk.java.net/jdk/pull/981