195aef9962
This uses the kdump(1) utrace support code directly until a common library is created. This allows malloc(3) tracing with MALLOC_CONF=utrace:true and rtld tracing with LD_UTRACE=1. Unknown utrace(2) data is just printed as hex. PR: 43819 [inspired by] Reviewed by: jhb MFC after: 2 weeks Relnotes: yes Differential Revision: https://reviews.freebsd.org/D3819