This is a followup RFE to JDK-8342095, which implements vectorizing casts between subword types. However, char isn't supported with it because it involves changes to the backend. This patch proposes implementing casts with char for x86 which involves changing the implementation of VectorCastI2X, S2X, and B2X to support casting to T_CHAR. VectorUCastS2X can be used to implement casting from char to other types.