RFR: 8337302: Undefined type variable results in null [v2]

[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 refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  8337302: Undefined type variable results in null

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20535/files
  - new: https://git.openjdk.org/jdk/pull/20535/files/d9b6ccf1..932dd9a1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20535&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20535&range=00-01

  Stats: 32 lines in 2 files changed: 4 ins; 12 del; 16 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