CODETOOLS-7903094: JMH: Replace Math.log with predictable code in samples

[shipilev]

Looks like Math.log is no longer intrinsified into C2 IR, so dead code / constant fold examples no longer work. It seems to have started since JDK 9 and JDK-8152907 that now defers the computation of Math.log to quick LIBM stub. It does, however, limits the compiler optimizations around the Math.log, and samples do not work properly. The samples should not rely on JDK internals, and should just use the custom written payload.

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Progress

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Issue

• CODETOOLS-7903094: JMH: Replace Math.log with predictable code in samples

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