8380651: [ubsan] gc/logging/TestGCId.java triggers runtime error: division by zero in shenandoahAdaptiveHeuristics

[kdnilsen]

Test for divisor equal zero and behave differently when calculating slope of best-fit line to predict GC time.

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Issue

• JDK-8380651: [ubsan] gc/logging/TestGCId.java triggers runtime error: division by zero in shenandoahAdaptiveHeuristics (Bug - P4)

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[kdnilsen]

Passes Amazon CI pipline tests.

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[openjdk]

@kdnilsen The following labels will be automatically applied to this pull request:

• hotspot-gc
• shenandoah

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[mlbridge]

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• 00: Full (639fef8d)