Convert lwlock.c to use the new shmem allocation functions

It seems like a good candidate to convert first because it needs to
initialized before any other subsystem, but other than that it's
nothing special.

Reviewed-by: Ashutosh Bapat <[email protected]>
Reviewed-by: Matthias van de Meent <[email protected]>
Reviewed-by: Daniel Gustafsson <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/CAExHW5vM1bneLYfg0wGeAa=52uij3z4vkd3aj72x8fw6k3k...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/a006bc7b1699d952afcb6d786343e8bf0ecc61d6

Modified Files
--------------
src/backend/postmaster/postmaster.c |  16 +++---
src/backend/storage/ipc/ipci.c      |  13 -----
src/backend/storage/lmgr/lwlock.c   | 100 +++++++++++++++++-------------------
src/backend/tcop/postgres.c         |  16 +++---
src/include/storage/lwlock.h        |   2 -
src/include/storage/subsystemlist.h |   9 +++-
6 files changed, 75 insertions(+), 81 deletions(-)

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