[VE] Change to ignore wrong condition code

Change to ignore wrong condition code in VEValToCondCode.  Because
this assertion may cause crash depend on input from corrupted
binary files.

TODO: change to not parse wrong condition code.

Author: kaz7

llvm/lib/Target/VE/VE.h

@@ -268,7 +268,8 @@ inline static VECC::CondCode VEValToCondCode(unsigned Val, bool IsInteger) {
       return VECC::CC_AT;
     }
   }
-  llvm_unreachable("Invalid cond code");
+  // Invalid condition may come through disassembler from corrupted input.
+  // Therefore, return AF instead of `llvm_unreachable`
   return VECC::CC_AF;
 }