RFR: 8254575: C2: Clean up unused TRACK_PHI_INPUTS assertion code

[Roberto Castañeda Lozano]

On Tue, 13 Oct 2020 16:19:41 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Remove assertion code that was disabled in all build configurations.
>
> Good.

Thanks for the reviews!

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PR: https://git.openjdk.java.net/jdk/pull/606