pg_test_timing: Show additional TSC clock source debug info

instrumentation: Avoid CPUID 0x15/0x16 for Hypervisor TSC frequency

pg_test_timing: Also test RDTSC[P] timing, report time source, TSC frequency

instrumentation: Use Time-Stamp Counter on x86-64 to lower overhead

instrumentation: Standardize ticks to nanosecond conversion method

Replace remaining uses of "whitelist".

pgindent: whitelist/blacklist -> additional/excluded.

Rename "enum blacklist" to "uncommitted enums".

code: replace most remaining uses of 'master'.

docs: replace 'master process' with 'supervisor process' where appropriate.

Fix LookupTupleHashEntryHash() pipeline-stall issue.

HashAgg: before spilling tuples, set unneeded columns to NULL.

Revert "Use CP_SMALL_TLIST for hash aggregate"