[code-reflection] RFR: Opening Hat Dialect for Handling Barriers and Shared/Private Memory [v11]

[Juan Fumero]

> This patch creates a new dialect for HAT for handling barriers, local (or shared) memory declaration of types, and private memory declariton. It extends the `Op`s provided by code-reflection with a new `HatOp` the dialect.
> 
> It is enabled by default. 
> 
> TODO: We should move the Hat Config to a common place to be able to use it in the Hat core module, not just in the code gen.

Juan Fumero has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 32 commits:

 - clean-up
 - Merge branch 'code-reflection' into hat/dialect/ops
 - [hat] Dialect fixed after last merge
 - Merge branch 'code-reflection' into hat/dialect/ops
 - [hat] Eliminate the call to opName
 - [hat] Move dialectify passes to dialectify phases for HAT
 - minor cleanup
 - [hat] First prototype with dialects working
 - [hat] dialects - refactor
 - [hat] dialect for thread-accessors
 - ... and 22 more: https://git.openjdk.org/babylon/compare/5ddaa81a...37ff6e7d

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Changes: https://git.openjdk.org/babylon/pull/560/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=560&range=10
  Stats: 2083 lines in 37 files changed: 1898 ins; 137 del; 48 mod
  Patch: https://git.openjdk.org/babylon/pull/560.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/560/head:pull/560

PR: https://git.openjdk.org/babylon/pull/560