[Parser] Add parsing of function's contract either before or after type constraints

compiler/psi/src/org/jetbrains/kotlin/parsing/KotlinParsing.java

@@ -1671,10 +1671,14 @@ public class KotlinParsing extends AbstractKotlinParsing {
             parseTypeRef();
         }
 
-        parseFunctionContract();
+        boolean functionContractOccurred = parseFunctionContract();
 
         parseTypeConstraintsGuarded(typeParameterListOccurred);
 
+        if (!functionContractOccurred) {
+            parseFunctionContract();
+        }
+
         if (at(SEMICOLON)) {
             advance(); // SEMICOLON
         }
@@ -1995,10 +1999,12 @@ public class KotlinParsing extends AbstractKotlinParsing {
         constraint.done(TYPE_CONSTRAINT);
     }
 
-    private void parseFunctionContract() {
+    private boolean parseFunctionContract() {
         if (at(CONTRACT_KEYWORD)) {
             myExpressionParsing.parseContractDescriptionBlock();
+            return true;
         }
+        return false;
     }
 
     /*