[NFC] Pre- increment and decrement where possible

lib/SIL/IR/AbstractionPattern.cpp

@@ -613,7 +613,7 @@ AbstractionPattern::getFunctionParamType(unsigned index) const {
 
       if (!errorInfo.isErrorParameterReplacedWithVoid()) {
         if (paramIndex >= errorParamIndex) {
-          paramIndex++;
+          ++paramIndex;
         }
       }
     }