RFR: 8275670: ciReplay: java.lang.NoClassDefFoundError when trying to load java/lang/invoke/LambdaForm$MH

[Dean Long]

The invokedynamic support added by 8271911 was incomplete.  In particular, it failed to search through argL fields.  This change fixes that, adds a test, and also cleans up the code a bit.

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Commit messages:
 - cleanup test
 - search through argL fields

Changes: https://git.openjdk.java.net/jdk/pull/6243/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6243&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275670
  Stats: 116 lines in 3 files changed: 90 ins; 1 del; 25 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6243.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6243/head:pull/6243

PR: https://git.openjdk.java.net/jdk/pull/6243