Add ability to run a function on a given thread #1116

Job	Run time
android-intel (x86)	4m 41s
gir	1m 16s
freebsd-arm64	1m 55s
android-intel (x86_64)	4m 57s
android-arm (arm)	1m 51s
android-arm (arm64)	2m 15s
ios-arm64	3m 27s
linux-x86	2m 39s
linux-mips (mips, g++-mips-linux-gnu)	1m 16s
linux-x86_64	2m 15s
linux-mips (mipsel, g++-mipsel-linux-gnu)	1m 14s
qnx-armeabi	2m 18s
linux-mips (mips64, g++-mips64-linux-gnuabi64)	1m 16s
macos-x86_64	6h 0m 13s
windows (amd64_x86)	6h 0m 1s
linux-mips (mips64el, g++-mips64el-linux-gnuabi64)	1m 15s
windows (amd64)	6h 0m 0s
	18h 32m 49s

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