* master: (167 commits)
  stats: Avoid asserts in fuzz-tests by eliminating arbitrary length limits, using the new MemBlock wrapper for memcpy (envoyproxy#8779)
  Make %UPSTREAM_LOCAL_ADDRESS% access-log format work for HTTP requests. (envoyproxy#9362)
  tools: API boosting support for using decls and enum constants. (envoyproxy#9418)
  Fix incorrect cluster InitializePhase type (envoyproxy#9379)
  build: fix merge race between envoyproxy#9241 and envoyproxy#9413. (envoyproxy#9427)
  fuzz: fix incorrect evaluator test (envoyproxy#9402)
  server: fix bogus startup log message (envoyproxy#9404)
  tools: Add protoxform tests (envoyproxy#9241)
  api: options after import (envoyproxy#9413)
  misc: use std::move instead of constructing a copy (envoyproxy#9415)
  tools: API boosting support for rewriting elaborated types. (envoyproxy#9375)
  docs: fix invalid transport_socket value (envoyproxy#9403)
  fix typo in docs (envoyproxy#9394)
  srds: remove to-de-removed scopes first and then apply additions to avoid scope key conflict. (envoyproxy#9366)
  api: generate whole directory and sync (envoyproxy#9382)
  bazel: Add load statements for proto_library (envoyproxy#9367)
  Fix typo (envoyproxy#9388)
  Correct test of OptionsImpl argc type (Was: Correct type for std::array size() result) (envoyproxy#9290)
  http1 encode trailers in chunk encoding (envoyproxy#8667)
  Add mode to PipeInstance (envoyproxy#8423)
  ...

…yproxy#9418)

Via AST node matchers on UsingDecl and DeclRefExpr. This commit also
refactors the clang::tooling::SourceFileCallbacks run() routine, by
moving to a per AST node dispatch model. This will support scaling to
additional AST node types in the future without having run() grow to
an unreadable length.

Risk level: Low
Testing: Additional golden tests.

Part of envoyproxy#8082.

Signed-off-by: Harvey Tuch <htuch@google.com>
Signed-off-by: Prakhar <prakhar_au@yahoo.com>