Fix signature of String.Ctor(ReadOnlySpan<char>)
Fix signature of String.Ctor(ReadOnlySpan<char>)

The signature is missing the "static" specifier. I have verified locally that after fixing this the UAPAOT test Ctor_CharSpan starts to pass in release mode.

Thanks

Tomas

[tfs-changeset: 1669109]

yizhang82/corert,gregkalapos/corert,shrah/corert,shrah/corert,shrah/corert,gregkalapos/corert,yizhang82/corert,yizhang82/corert,gregkalapos/corert,gregkalapos/corert,shrah/corert,yizhang82/corert