1. Return array of SDValue from simplifyAssumingCCVal and remove use of

   findCCUse from simplifyAssumingCCVal.
2. Remove ICMP and TM case from findCCUse.
3. Generaize TrueVal and FalseVal in outermost select_ccmask in
   combineSELECT_CCMASK,
4. Emulating TM for all CCMask.
5. Incorporated other code review feedback.

Author: anoopkg6