RFR: 8292383: Create a SymbolHandle type to use for ResourceHashtable

[Harold Seigel]

On Fri, 26 Aug 2022 21:00:57 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This change creates a SymbolHandle which shares code with TempNewSymbol and moves them to their own header file.  We could expand this use if needed for GrowableArrays and other things where we have some various Symbol increment/decrement refcounts now.  Changed a few ResourceHashtables that take Symbol* keys to use SymbolHandle and verified the refcounts.  Also fixed the gtest.
> Tested with tier1-7.

LGTM

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Marked as reviewed by hseigel (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10052