RFR: 8274161: Cleanup redundant casts in java.compiler

[Jonathan Gibbons]

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.

The module name in the summary (java.compiler) does not match the module name in the edited files (jdk.compiler)

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