RequirementMachine: Make RewritePath::getRulesInEmptyContext() const

Author: slavapestov

lib/AST/RequirementMachine/RewriteLoop.cpp

@@ -346,7 +346,7 @@ bool RewritePath::replaceRuleWithPath(unsigned ruleID,
 
 SmallVector<unsigned, 1>
 RewritePath::getRulesInEmptyContext(const MutableTerm &term,
-                                    const RewriteSystem &system) {
+                                    const RewriteSystem &system) const {
   // Rules appearing in empty context (possibly more than once).
   llvm::SmallDenseSet<unsigned, 2> rulesInEmptyContext;
   // The number of times each rule appears (with or without context).

lib/AST/RequirementMachine/RewriteLoop.h

@@ -412,7 +412,7 @@ class RewritePath {
   bool replaceRuleWithPath(unsigned ruleID, const RewritePath &path);
 
   SmallVector<unsigned, 1> getRulesInEmptyContext(const MutableTerm &term,
-                                                  const RewriteSystem &system);
+                                                  const RewriteSystem &system) const;
 
   void invert();