RFR: JDK-8042981: Strip type annotations in Types' utility methods [v4]

[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:

  Add changes from Liam.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/8984/files
  - new: https://git.openjdk.org/jdk/pull/8984/files/61cf9717..78d4c299

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=8984&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=8984&range=02-03

  Stats: 73 lines in 4 files changed: 13 ins; 37 del; 23 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