Log what caused each layer to be enabled #824

Job	Run time
codegen	13s
linux-32-no-asm	2m 48s
chromium	1m 33s
linux-no-asm	3m 16s
linux-32 (Debug)	1m 47s
linux (gcc, g++, Debug, ubuntu-20.04)	2m 57s
linux-32 (Release)	2m 3s
linux (gcc, g++, Debug, ubuntu-22.04)	3m 6s
linux (gcc, g++, Release, ubuntu-20.04)	6m 51s
linux (gcc, g++, Release, ubuntu-22.04)	7m 39s
linux (clang, clang++, Debug, ubuntu-20.04)	2m 16s
linux (clang, clang++, Debug, ubuntu-22.04)	2m 44s
linux (clang, clang++, Release, ubuntu-20.04)	4m 11s
linux (clang, clang++, Release, ubuntu-22.04)	4m 41s
mingw	1m 17s
windows_vs-no-asm (Win32)	4m 6s
mingw-no-asm	57s
windows_vs-no-asm (x64)	4m 2s
mingw-no-asm-explicit	57s
mingw-use-gas	46s
windows_clang (clang, Debug)	3m 38s
windows_vs (Win32, Debug)	5m 18s
windows_clang (clang, Release)	4m 17s
windows_vs (Win32, Release)	4m 25s
windows_clang (clang-cl, Debug)	3m 54s
windows_vs (x64, Debug)	5m 2s
windows_clang (clang-cl, Release)	2m 54s
windows_vs (x64, Release)	4m 52s
mac (Debug, APPLE_STATIC_LOADER=ON)	5m 31s
iOS	57s
Universal Binary Testing (STATIC ON) w/ Ninja	2m 6s
mac (Debug, APPLE_STATIC_LOADER=OFF)	4m 43s
tvOS	39s
Universal Binary Testing (STATIC ON) w/ Xcode	2m 32s
mac (Release, APPLE_STATIC_LOADER=ON)	4m 40s
Universal Binary Testing (STATIC OFF) w/ Ninja	1m 57s
mac (Release, APPLE_STATIC_LOADER=OFF)	5m 8s
Universal Binary Testing (STATIC OFF) w/ Xcode	3m 6s
	2h 3m 49s

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