Fix 32096 UBSAN issues in gprofng

Fixed UBSAN runtime errors such as:
 - load of value 4294967295, which is not a valid value for type 'Cmsg_warn'
 - null pointer passed as argument 2, which is declared to never be null
 - load of value 4294967295, which is not a valid value for type 'ProfData_type'
 - reference binding to misaligned address 0x00000357583c for type 'long unsigned int', which requires 8 byte alignment

gprofng/ChangeLog
2024-09-09  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>.

	PR gprofng/32096
	* src/BaseMetric.cc: Fix UBSAN runtime errors.
	* src/BaseMetric.h: Likewise.
	* src/Emsg.h: Likewise.
	* src/Experiment.cc: Likewise.
	* src/Table.h: Likewise.