RFR: JDK-8252409: JShell: Intersection types cause NoSuchFieldError

[Jan Lahoda]

>From the bug:
jshell> var test = (Serializable & Runnable) () -> {};
test ==> $Lambda$26/0x0000000800ba4248 at 5910e440

jshell> test
| Exception java.lang.NoSuchFieldError: test
| at (#2:1)

jshell> test.toString()
| Exception java.lang.NoSuchFieldError: test
| at (#3:1)


The reason is that the field generated for `var test = ...` has type `j.l.Object`, but the references to it use `Serializable`, and hence the field is not found. The proposal is to generate the field's type as an erased type of the intersection type.

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Commit messages:
 - Test cleanup.
 - JDK-8252409: JShell: Intersection types cause NoSuchFieldError

Changes: https://git.openjdk.java.net/jdk/pull/2284/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2284&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252409
  Stats: 26 lines in 5 files changed: 15 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2284.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2284/head:pull/2284

PR: https://git.openjdk.java.net/jdk/pull/2284