RFR: 8337302: Undefined type variable results in null [v3]

[Rafael Winterhalter]

> When a type uses a type variable without a declaration, no exception is thrown. This change triggers a `TypeNotFoundException` to be thrown.

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

  8337302: Add missing visibility modifiers.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20535/files
  - new: https://git.openjdk.org/jdk/pull/20535/files/932dd9a1..2dbb17c6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20535&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20535&range=01-02

  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20535.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20535/head:pull/20535

PR: https://git.openjdk.org/jdk/pull/20535