basic tracing #2402

Job	Run time
Analyse	4s
Build-macOS (4.14.1)	5m 1s
Build-Linux (4.08.1)	2m 5s
Cygwin	4s
Hygiene	17s
Test-macOS (4.14.1)	51m 49s
Build-Linux (4.09.1)	2m 7s
Build-Linux (4.10.2)	1m 57s
Build-Linux (4.11.2)	1m 54s
Build-Linux (4.12.1)	1m 54s
Build-Linux (4.13.1)	1m 57s
Build-Linux (5.0.0)	2m 2s
Build-Linux (5.1.0)	2m 27s
Build-Linux (4.14.1)	1m 58s
Build-Windows (x86_64-pc-cygwin, x86_64-pc-cygwin, 4.14.1)	39m 18s
Build-Windows (i686-w64-mingw32, x86_64-pc-cygwin, 4.14.1)	46m 48s
Build-Windows (x86_64-w64-mingw32, x86_64-pc-cygwin, 4.14.1)	44m 41s
Build-Windows (i686-pc-windows, x86_64-pc-cygwin, 4.14.1)	51m 4s
Build-Windows (x86_64-pc-windows, x86_64-pc-cygwin, 4.14.1)	54m 4s
Test-Linux (4.14.1)	13m 16s
Upgrade-Linux (4.14.1)	57s
Cold-Linux	5m 7s
Solvers-Linux (z3, 4.14.1)	46s
Solvers-Linux (0install, 4.14.1)	1m 22s
Solvers-macOS (z3, 4.14.1)	2m 30s
Solvers-macOS (0install, 4.14.1)	2m 17s
Upgrade-macOS (4.14.1)	3m 44s
	5h 41m 30s

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