RFR: 8265135: Reduce work initializing VarForms [v5]

[Claes Redestad]

> This patch reduces work done initializing VarForms - mostly observed when loading each VarHandle implementation class.
> 
> - Lazily resolve MemberNames.
> - Streamline MethodType creation. This reduces the number of MethodTypes created. 
> 
> Net effect is a reduction in bytecode executed per VH class by 50-60%.

Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:

  Add resolveOrNull for exploded MemberName

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3472/files
  - new: https://git.openjdk.java.net/jdk/pull/3472/files/f84f5194..1c2208c1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3472&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3472&range=03-04

  Stats: 24 lines in 2 files changed: 13 ins; 7 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3472.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3472/head:pull/3472

PR: https://git.openjdk.java.net/jdk/pull/3472