RFR: JDK-8042981: Strip type annotations in Types' utility methods [v7]

[Joe Darcy]

> Early review for JDK-8042981: "Strip type annotations in Types' utility methods". I work more often in the Element world rather than the Type word of the annotation processing APIs.
> 
> The type annotations on primitive types are *not* cleared by the existing annotation clearing mechanisms. I suspect Type.Visitor is missing a case for primitive types. Someone with familiarity with javac's type modeling should take a look; thanks.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Revert changes that will be done under JDK-8323684.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/8984/files
  - new: https://git.openjdk.org/jdk/pull/8984/files/342b091f..e389818d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=8984&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=8984&range=05-06

  Stats: 16 lines in 2 files changed: 0 ins; 1 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/8984.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/8984/head:pull/8984

PR: https://git.openjdk.org/jdk/pull/8984