RFR: 8278638: Remove FLAG_IS_CMDLINE(UseSharedSpaces)

[Harold Seigel]

On Tue, 14 Dec 2021 16:06:28 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

> Please review this small fix for bug JDK-827638.  The fix was tested by running Mach5 tiers 1 and 2 on Linux, Mac OS, and Windows, Mach5 tier 4 on Linux x64, and by building on linux-aarch64-zero and linux-x64-zero.
> 
> Thanks, Harold

Thanks Dan, Coleen, and Yumin for looking at this.  Pushing now to fix the build issues.

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PR: https://git.openjdk.java.net/jdk/pull/6835