RFR: 8294971: jdk.jlink jdk.tools.jimage.JImageTask is using ASM to verify classes

[Adam Sotona]

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jdk.jlink jdk.tools.jimage.JImageTask is using ASM to verify classes

This patch converts ASM calls to Classfile API.

Please review.

Thanks,
Adam

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Commit messages:
 - Merge branch 'master' into JDK-8294971-jlink-jimage
 - 8294971: jdk.jlink jdk.tools.jimage.JImageTask is using ASM to verify classes
 - removed obsolete javadoc from implementation classes
 - minor fix in CodeBuilder and added test cases to LDCTest
 - EntryMap::nextPowerOfTwo delegates to Long:numberOfLeadingZeros
 - fixed CodeBuilder:constantInstruction for -0.0d and -0.0f values and added test
 - Merge branch 'master' into JDK-8294982
 - fixed new lines at end of file
 - package jdk.internal.classfile.jdktypes moved to jdk.internal.classfile.java.lang.constant
 - fixed CodeRelabeler javadoc
 - ... and 179 more: https://git.openjdk.org/jdk/compare/cdcf5c1e...68009406

Changes: https://git.openjdk.org/jdk/pull/12943/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12943&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294971
  Stats: 15 lines in 2 files changed: 10 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/12943.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12943/head:pull/12943

PR: https://git.openjdk.org/jdk/pull/12943