8386802: ClassFile Util.entryList should consider non-RandomAccess lists

[aprilivy]

As noted in https://bugs.openjdk.org/browse/JDK-8386802, Util.entryList and Util.moduleEntryList copy their input lists using indexed access. This is fine for RandomAccess lists but can be inefficient for sequentially-accessed implementations.

This patch keeps the existing indexed path for RandomAccess lists and falls back to iteration otherwise. Regression coverage is added for non-RandomAccess inputs.

Testing:

• make CONF_CHECK=ignore java.base-java images
• make CONF_CHECK=ignore test-only TEST="test/jdk/jdk/classfile/UtilTest.java"
• make CONF_CHECK=ignore test-only TEST="test/jdk/jdk/classfile"
• make CONF_CHECK=ignore test-only TEST="test/jdk:tier1" JTREG="VERBOSE=summary"

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Issue

• JDK-8386802: ClassFile Util.entryList should consider non-RandomAccess lists (Bug - P4)

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[aprilivy]

@liach could you take a look? Thanks!

[mlbridge]

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