Add support for additional DTrace probes.

src/backend/access/transam/slru.c

src/backend/executor/execScan.c

src/backend/executor/nodeAgg.c

src/backend/executor/nodeGroup.c

src/backend/executor/nodeHash.c

src/backend/executor/nodeHashjoin.c

src/backend/executor/nodeLimit.c

src/backend/executor/nodeMaterial.c

src/backend/executor/nodeMergejoin.c

src/backend/executor/nodeNestloop.c

src/backend/executor/nodeSetOp.c

src/backend/executor/nodeSort.c

src/backend/executor/nodeSubplan.c

src/backend/executor/nodeUnique.c

src/backend/utils/probes.d