RFR: 8274161: Cleanup redundant casts in java.compiler

[Vicente Romero]

On Fri, 27 Aug 2021 18:30:31 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> Such casts are actually redundant, but they are inserted, because variable is declared with too weak type.

looks good

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Marked as reviewed by vromero (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5283