RFR: 6983726: Reimplement MethodHandleProxies.asInterfaceInstance [v16]

[Chen Liang]

> As John Rose has pointed out in this issue, the current j.l.r.Proxy based implementation of MethodHandleProxies.asInterface has a few issues:
> 1. Exposes too much information via Proxy supertype (and WrapperInstance interface)
> 2. Does not allow future expansion to support SAM[^1] abstract classes
> 3. Slow (in fact, very slow)
> 
> This patch addresses all 3 problems:
> 1. It updates the WrapperInstance methods to take an `Empty` to avoid method clashes
> 2. This patch obtains already generated classes from a ClassValue by the requested interface type; the ClassValue can later be updated to compute implementation generation for abstract classes as well.
> 3. This patch's faster than old implementation in general.
> 
> 
> Benchmark                                                          Mode  Cnt      Score      Error  Units
> MethodHandleProxiesAsIFInstance.baselineAllocCompute               avgt   15      1.483 ±    0.025  ns/op
> MethodHandleProxiesAsIFInstance.baselineCompute                    avgt   15      0.264 ±    0.006  ns/op
> MethodHandleProxiesAsIFInstance.testCall                           avgt   15      1.773 ±    0.040  ns/op
> MethodHandleProxiesAsIFInstance.testCreate                         avgt   15     16.754 ±    0.411  ns/op
> MethodHandleProxiesAsIFInstance.testCreateCall                     avgt   15     19.609 ±    1.598  ns/op
> MethodHandleProxiesAsIFInstanceCall.callDoable                     avgt   15      0.424 ±    0.024  ns/op
> MethodHandleProxiesAsIFInstanceCall.callHandle                     avgt   15      1.936 ±    0.008  ns/op
> MethodHandleProxiesAsIFInstanceCall.callInterfaceInstance          avgt   15      1.766 ±    0.014  ns/op
> MethodHandleProxiesAsIFInstanceCall.callLambda                     avgt   15      0.414 ±    0.005  ns/op
> MethodHandleProxiesAsIFInstanceCall.constantDoable                 avgt   15      0.271 ±    0.006  ns/op
> MethodHandleProxiesAsIFInstanceCall.constantHandle                 avgt   15      0.263 ±    0.004  ns/op
> MethodHandleProxiesAsIFInstanceCall.constantInterfaceInstance      avgt   15      0.266 ±    0.005  ns/op
> MethodHandleProxiesAsIFInstanceCall.constantLambda                 avgt   15      0.262 ±    0.003  ns/op
> MethodHandleProxiesAsIFInstanceCall.direct                         avgt   15      0.264 ±    0.005  ns/op
> MethodHandleProxiesAsIFInstanceCreate.createCallInterfaceInstance  avgt   15     18.000 ±    0.181  ns/op
> MethodHandleProxiesAsIFInstanceCreate.createCallLambda             avgt   15  17624.673 ± 2404.853  ns/op
> MethodHandleProxiesAsIFInstanceCreate.createInterfaceInstance      avgt   15     17.554 ±    0.748  ns/op
> MethodHandleProxiesAsIFInstanceCreate.createLambda                 avgt   15  16860.341 ± 1270.982  ns/op
> MethodHandleProxiesSuppl.testInstanceTarget                        avgt   15      0.405 ±    0.006  ns/op
> MethodHandleProxiesSuppl.testInstanceType                          avgt   15      0.343 ±    0.005  ns/op
> MethodHandleProxiesSuppl.testIsWrapperInstance                     avgt   15      0.375 ±    0.021  ns/op
> 
> 
> Additionally, an obsolete `ProxyForMethodHandle` test was removed, for it's no longer applicable.
> 
> [^1]: single abstract method

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

  Remove assertion, no longer true with teleport definition in MHP

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13197/files
  - new: https://git.openjdk.org/jdk/pull/13197/files/836d9d0b..bd21e68e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13197&range=15
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13197&range=14-15

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13197.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13197/head:pull/13197

PR: https://git.openjdk.org/jdk/pull/13197