basectx: Store path constraints into the context for now

common/kernel/basectx.h

@@ -34,6 +34,7 @@
 #include "nextpnr_types.h"
 #include "property.h"
 #include "str_ring_buffer.h"
+#include "timing_constraint.h"
 
 NEXTPNR_NAMESPACE_BEGIN
 
@@ -84,6 +85,9 @@ struct BaseCtx
     // Context meta data
     dict<IdString, Property> attrs;
 
+    // Path constraints set via SDC
+    std::vector<PathConstraint> path_constraints;
+
     // Fmax data post timing analysis
     TimingResult timing_result;