pgsql: Add JIT deform_counter

Add JIT deform_counter

generation_counter includes time spent on both JIT:ing expressions
and tuple deforming which are configured independently via options
jit_expressions and jit_tuple_deforming. As they are combined in
the same counter it's not apparent what fraction of time the tuple
deforming takes.

This adds deform_counter dedicated to tuple deforming, which allows
seeing more directly the influence jit_tuple_deforming is having on
the query. The counter is exposed in EXPLAIN and pg_stat_statements
bumpin pg_stat_statements to 1.11.

Author: Dmitry Dolgov <9erthalion6(at)gmail(dot)com>
Reviewed-by: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Reviewed-by: Daniel Gustafsson <daniel(at)yesql(dot)se>
Discussion: https://postgr.es/m/20220612091253.eegstkufdsu4kfls@erthalion.local

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/5a3423ad8ee171fbf08317917981effe47d211eb

Modified Files
--------------
contrib/pg_stat_statements/Makefile | 1 +
contrib/pg_stat_statements/meson.build | 1 +
.../pg_stat_statements--1.10--1.11.sql | 69 ++++++++++++++++++++++
contrib/pg_stat_statements/pg_stat_statements.c | 35 ++++++++++-
.../pg_stat_statements/pg_stat_statements.control | 2 +-
doc/src/sgml/jit.sgml | 2 +-
doc/src/sgml/pgstatstatements.sgml | 19 ++++++
src/backend/commands/explain.c | 12 +++-
src/backend/jit/jit.c | 1 +
src/backend/jit/llvm/llvmjit_expr.c | 6 ++
src/include/jit/jit.h | 3 +
11 files changed, 145 insertions(+), 6 deletions(-)