llvm-project

e2956fef - [libc][math] Add LIBC_CONF_MATH_USE_SYSTEM_FENV / LIBC_MATH_USE_SYSTEM_FENV (#172902)

[libc][math] Add LIBC_CONF_MATH_USE_SYSTEM_FENV / LIBC_MATH_USE_SYSTEM_FENV (#172902) This is to allow math function implementations to use system libc's fenv.h instead of internal fenv implementations.