[jdk13u-dev] RFR: 8216324: GetClassMethods is confused by the presence of default methods in super interfaces

[Ekaterina Vergizova]

I'd like to backport 8216324 to 13u for parity with 11u.
The patch applies cleanly.
Tested with tier1 and other jvmti tests; new test fails without the patch, passes with it.

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Commit messages:
 - Backport 277ec3d26080275e3c14b7e3f40c15e5cdfa3821

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/109/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=109&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8216324
  Stats: 261 lines in 5 files changed: 214 ins; 8 del; 39 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/109.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/109/head:pull/109

PR: https://git.openjdk.java.net/jdk13u-dev/pull/109