Build compiler-rt with C++ exception tag definition #1105

Job	Run time
Build only sysroot - default	3m 14s
Build arm64-macos	14m 46s
Build only sysroot - exceptions	3m 4s
Build x86_64-windows	12m 6s
Build x86_64-macos	6m 42s
Build arm64-windows	15m 13s
Build x86_64-linux	14m 42s
Build arm64-linux	6m 33s
Test standalone toolchain	1s
Finalize wasi-sdk artifacts	1s
	1h 16m 22s

Provide feedback