RFR: 8350462: MethodTypeForm.LF_INTERPRET can cache the MemberName instead

[Zihao Lin]

Modify the cache in MethodTypeForm that currently stores the LF_INTERPRET Lambda form. Instead of caching the entire LambdaForm, change it to store a SoftReference<MemberName>. This will avoid unnecessary memory usage.

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Commit messages:
 - Merge branch 'openjdk:master' into JDK-8350462
 - 8350462: MethodTypeForm.LF_INTERPRET can cache the MemberName instead

Changes: https://git.openjdk.org/jdk/pull/24468/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24468&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350462
  Stats: 31 lines in 2 files changed: 17 ins; 9 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/24468.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24468/head:pull/24468

PR: https://git.openjdk.org/jdk/pull/24468