RFR: JDK-8256950: Add record attribute support to symbol generator CreateSymbols [v5]

[Jan Lahoda]

> Adding support for record classes in the historical data for ct.sym. This includes a few changes not strictly needed for the change:
> -updating and moving tests into test/langtools, so that it is easier to run them.
> -fixing Record attribute reading in javac's ClassReader (used for tests, but seems like the proper thing to do anyway).
> -fixing the -Xprint annotation processor to print record component annotations.
> 
> Changes to jdk.jdeps' classfile library are needed so that the ct.sym creation works.

Jan Lahoda has updated the pull request incrementally with one additional commit since the last revision:

  Blank lines do not count for the text block indentation, removing them.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1480/files
  - new: https://git.openjdk.java.net/jdk/pull/1480/files/9ab7153a..3aaaf28c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1480&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1480&range=03-04

  Stats: 15 lines in 1 file changed: 0 ins; 0 del; 15 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1480.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1480/head:pull/1480

PR: https://git.openjdk.java.net/jdk/pull/1480