RFR: 8310735: Build failure after JDK-8310577 with GCC8

[Coleen Phillimore]

On Fri, 23 Jun 2023 13:45:21 GMT, Jie Fu <jiefu at openjdk.org> wrote:

> Since `enum BasicType` had been changed to `enum BasicType : u1`, `basic_type >= 0` would be always true.
> So it's safe to remove such conditions in these asserts.
> Thanks.

Thanks for fixing this.

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PR Review: https://git.openjdk.org/jdk/pull/14627#pullrequestreview-1495268081