Public review of rearchitected front-end type annotations pipeline

[Eric McCorkle]

Hello,

This is the public review of the second in my series of patches dealing
with type annotations.

http://cr.openjdk.java.net/~emc/8027262/

This patch rearchitects the type annotations pipeline, integrating
handling of type annotations directly into the javac
MemberEnter/Annotate/Attr pipeline.  It represents the majority of the
work I have been doing regarding type annotations for 8u20.

The handling of type annotations is now dispatched by the MemberEnter or
Attr visitors and uses information from those visitors.  Most of the
actual functionality is now implemented in Annotate.

The new test Stress.java is the test for this patch.  Stress.java will
cause 8-release javac to fail with an assertion failure.  Its addition
to the test suite demonstrates that this change fixes those cases.

This patch addresses a number of JBS issues:
https://bugs.openjdk.java.net/browse/JDK-8027262
https://bugs.openjdk.java.net/browse/JDK-8027261
https://bugs.openjdk.java.net/browse/JDK-8027258
https://bugs.openjdk.java.net/browse/JDK-8027182
and possibly others as well.

Note: this patch does not attempt to remove code made obsolete; however,
any such code is very clearly marked as deprecated.  Removal of dead
code will be done in the last of the series.  This patch also does not
attempt to re-enable tests which were previously disabled.  That will be
done as a separate patch as well.
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