fix-tests
[libc] Add a simple StringStream class.
[libc] fix line buffered empty file writes
[libc] Implement FLAGS option for generating all combinations for targets.
[libc] Add a convenience class and function for integer to string conversion.
[libc] Add holder class for va_lists
[libc] apply new lint rules
[libc] Add Uint128 type as a fallback when __uint128_t is not available.
[libc] add atof, strtof and strtod
[libc] Add compound assignment and pre-increment operators to UInt.