pgsql: Split CollateClause into separate raw and analyzed node types.

Split CollateClause into separate raw and analyzed node types.

CollateClause is now used only in raw grammar output, and CollateExpr after
parse analysis. This is for clarity and to avoid carrying collation names
in post-analysis parse trees: that's both wasteful and possibly misleading,
since the collation's name could be changed while the parsetree still
exists.

Also, clean up assorted infelicities and omissions in processing of the
node type.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/8acdb8bf9cebc42cee5aa96a2d594756b44173c9

Modified Files
--------------
src/backend/catalog/dependency.c | 43 ++++++++++-----
src/backend/commands/typecmds.c | 2 +-
src/backend/executor/execQual.c | 54 ++++++++++----------
src/backend/nodes/copyfuncs.c | 21 +++++++-
src/backend/nodes/equalfuncs.c | 16 +++++-
src/backend/nodes/nodeFuncs.c | 45 +++++++++-------
src/backend/nodes/outfuncs.c | 24 +++++++--
src/backend/nodes/readfuncs.c | 35 ++++++-------
src/backend/optimizer/util/clauses.c | 48 +++++++++++++++++
src/backend/parser/gram.y | 10 ++--
src/backend/parser/parse_coerce.c | 16 ++++--
src/backend/parser/parse_expr.c | 10 ++--
src/backend/parser/parse_target.c | 2 +-
src/backend/parser/parse_type.c | 2 +-
src/backend/parser/parse_utilcmd.c | 2 +-
src/backend/utils/adt/ruleutils.c | 60 ++++++++++++++++-----
src/include/catalog/catversion.h | 2 +-
src/include/nodes/nodes.h | 3 +-
src/include/nodes/parsenodes.h | 11 ++++
src/include/nodes/primnodes.h | 24 ++++----
src/pl/plpgsql/src/pl_exec.c | 3 +
src/test/regress/expected/collate.linux.utf8.out | 4 +-
22 files changed, 298 insertions(+), 139 deletions(-)