cmake COMPILER_RT_HAS_WD4391_FLAG examples

Lewuathe/mlir-hello thirdparty/llvm-project/compiler-rt/cmake/config-ix.cmake :161 

check_cxx_compiler_flag(/wd4391 COMPILER_RT_HAS_WD4391_FLAG)

trailofbits/polytracker polytracker/src/compiler-rt/cmake/config-ix.cmake :117 

check_cxx_compiler_flag(/wd4391 COMPILER_RT_HAS_WD4391_FLAG)

CTSRD-CHERI/cheribsd contrib/subrepo-cheri-compiler-rt/cmake/config-ix.cmake :138 

check_cxx_compiler_flag(/wd4391 COMPILER_RT_HAS_WD4391_FLAG)