+ * version 12: added MONO_COUNTER_PROFILER
+ * version 13: added MONO_GC_EVENT_{PRE_STOP_WORLD_LOCKED,POST_START_WORLD_UNLOCKED}
+ added TYPE_META + TYPE_SYNC_POINT
+ removed il and native offset in TYPE_SAMPLE_HIT
+ methods in backtraces are now encoded as proper method pointers
+ removed flags in backtrace format
+ removed flags in metadata events
+ changed the following fields to a single byte rather than leb128
+ TYPE_GC_EVENT: event_type, generation
+ TYPE_HEAP_ROOT: root_type
+ TYPE_JITHELPER: type
+ TYPE_SAMPLE_HIT: sample_type
+ TYPE_CLAUSE: clause_type
+ TYPE_SAMPLE_COUNTERS_DESC: type, unit, variance
+ TYPE_SAMPLE_COUNTERS: type
+ added time fields to all events that were missing one
+ TYPE_HEAP_OBJECT
+ TYPE_HEAP_ROOT
+ TYPE_SAMPLE_USYM
+ TYPE_SAMPLE_COUNTERS_DESC
+ TYPE_COVERAGE_METHOD
+ TYPE_COVERAGE_STATEMENT
+ TYPE_COVERAGE_CLASS
+ TYPE_COVERAGE_ASSEMBLY
+ moved the time field in TYPE_SAMPLE_HIT to right after the event byte, now encoded as a regular time field
+ changed the time field in TYPE_SAMPLE_COUNTERS to be encoded as a regular time field (in nanoseconds)
+ added TYPE_GC_FINALIZE_{START,END,OBJECT_START,OBJECT_END}