RFR: 8285401: Proxy class initializer should use 3-arg `Class.forName` to avoid unnecessary class initialization [v2]

[liach]

> Simplify calls `Class.forName(String, boolean, ClassLoader)` instead of `Class.forName(String)`. `make test TEST="jtreg:test/jdk/java/lang/reflect/Proxy"` passes, with the new `LazyInitializationTest` failing the eager initialization check on the baseline and passing with this patch.
> 
> On a side note, this might reduce the number of methods that can be encoded in a proxy due to code attribute size restrictions; we probably would address that in another issue, as we never mandated a count of methods that the proxy must be able to implement.
> 
> Mandy, would you mind review this?

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

  remove unused field

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8800/files
  - new: https://git.openjdk.java.net/jdk/pull/8800/files/c1b522d5..64a70479

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8800&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8800&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8800.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8800/head:pull/8800

PR: https://git.openjdk.java.net/jdk/pull/8800