RFR: 8307588: [JVMCI] HotSpotConstantPool#lookupBootstrapMethodInvocation broken by JDK-8301995 [v2]

[Josef Eisl]

> As a result of the changes for [JDK-8301995](https://bugs.openjdk.org/browse/JDK-8301995), `HotSpotConstantPool#lookupBootstrapMethodIntrospection` is broken as it no longer decodes the correct constant pool index for looking up the bootstrap method invocation for invokedynamic.
> 
> This fixes the problem and modifies `TestDynamicConstant` to exercise the code in question.
> 
> I've manually verified that this solved the native image issues that uncovered the problem.

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

  Update copyright date in TestDynamicConstant.java

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13858/files
  - new: https://git.openjdk.org/jdk/pull/13858/files/b271e842..239a368f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13858&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13858&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13858.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13858/head:pull/13858

PR: https://git.openjdk.org/jdk/pull/13858