8361487: [ubsan] test_committed_virtualmemory.cpp check_covered_pages shows overflow

[afshin-zafari]

In the test, page-numbers to be checked are passed to a checker function in which they will be changed to -1 if they are as expected.
Use of these -1 values for page-numbers in consequent checks result in overflow in pointer arithmetic of base + (-1) * page_size which is certainly less than base.

The fix is to skip cases where page-number under checking is -1.
Tested under UBSAN build.

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• JDK-8361487: [ubsan] test_committed_virtualmemory.cpp check_covered_pages shows overflow (Bug - P4)

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