lurking remnants of PROF and GPROF builds should be removed
Trying to discover why mutex_enter on x86 wasn't found by opengrok recently, I stumbled into ENTRY_NP() which is much like ENTRY, except it includes a call to MCOUNT, MCOUNT is defined conditionally to call _mcount in PROF and GPROF builds (suggesting that _NP is "no profiling"). Since the PROF and GPROF builds have long since been removed (6417866, July 2006), we could define ENTRY_NP and ENTRY to be the same (at the very least). If there are few consumers, they could probably all be switched to ENTRY and ENTRY_NP actually removed. ENTRY2/ENTRY_NP2 should probably be treated similarly.