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Wrong long to hex conversion
long.ToString("x16") returns a useless string.
As a consequence the Number_ToString_Test in systemlib2.sln fails.
The problem does not exist on the emulator, just on ARM targets.
The reason is a wrong format string in \CLR\Libraries\CorLib\corlib_native_System_Number.cpp.
In line 62 & 68, formatStr must be replaced by "%llX".