8374195: TestReplaceNarrowPhiWithBottomPhi fails on ppc64 platforms in (fast)debug

[TheRealMDoerr]

This test makes assumptions about the C2 ideal graph which are not true for PPC64. We need to get tests green also in jdk26 where the new test has landed in the meantime, so simply disabling it for the platform.
Test improvements can be done later if needed.

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• JDK-8374195: TestReplaceNarrowPhiWithBottomPhi fails on ppc64 platforms in (fast)debug (Bug - P3)

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