8379503: Intern constant expression of type String

[mabbay]

Explicitly intern the result of operation that model constant expression of type String, before interpretation and before bytecode generation. Not all cases are handled, because of the limitation we have in operation evaluation API.
A more general approach is to implement constant folding.

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Progress

• Change must not contain extraneous whitespace

Issue

• JDK-8379503: Intern constant expression of type String (Enhancement - P4)

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