IR: Adds DPPS and DPPD source masks

This will get used for these instructions soon

FEXCore/include/FEXCore/IR/IR.h

@@ -541,6 +541,8 @@ enum IndexNamedVectorConstant : uint8_t {
   INDEXED_NAMED_VECTOR_PSHUFHW,
   INDEXED_NAMED_VECTOR_PSHUFD,
   INDEXED_NAMED_VECTOR_SHUFPS,
+  INDEXED_NAMED_VECTOR_DPPS_MASK,
+  INDEXED_NAMED_VECTOR_DPPD_MASK,
   INDEXED_NAMED_VECTOR_MAX,
 };