rename c++20 keyword s/requires/requires_range.

 See https://en.cppreference.com/w/cpp/language/requires for more details.

Author: nqbit

common/kernel/constraints.impl.h

@@ -92,7 +92,7 @@ bool Constraints<StateCount, StateType, CountType>::isValidBelForCellType(const
             }
             break;
         case CONSTRAINT_TAG_REQUIRES:
-            if (!tags[constraint.tag()].requires(constraint.states())) {
+            if (!tags[constraint.tag()].requires_range(constraint.states())) {
                 return false;
             }
             break;

common/kernel/exclusive_state_groups.h

@@ -127,7 +127,7 @@ template <size_t StateCount, typename StateType = int8_t, typename CountType = u
 
     template <typename StateRange>
     bool
-        requires(const StateRange &state_range)
+        requires_range(const StateRange &state_range)
     const
     {
         if (state < 0) {

common/kernel/exclusive_state_groups.impl.h

@@ -70,7 +70,7 @@ void ExclusiveStateGroup<StateCount, StateType, CountType>::explain_requires(con
                                                                              const Definition &definition, BelId bel,
                                                                              const StateRange state_range) const
 {
-    if (requires(state_range)) {
+    if (requires_range(state_range)) {
         log_info("Placing cell %s at bel %s does not violate %s.%s\n", cell.c_str(ctx), ctx->nameOfBel(bel),
                  object.c_str(ctx), definition.prefix.c_str(ctx));
     } else {