cmMakefile: Make the cmState::Snapshot accessible.

Source/cmMakefile.cxx

@@ -4657,6 +4657,11 @@ void cmMakefile::StoreMatches(cmsys::RegularExpression& re)
   this->MarkVariableAsUsed(nMatchesVariable);
 }
 
+cmState::Snapshot cmMakefile::GetStateSnapshot() const
+{
+  return this->StateSnapshot;
+}
+
 //----------------------------------------------------------------------------
 cmPolicies::PolicyStatus
 cmMakefile::GetPolicyStatus(cmPolicies::PolicyID id) const

Source/cmMakefile.h

@@ -819,6 +819,8 @@ public:
   void ClearMatches();
   void StoreMatches(cmsys::RegularExpression& re);
 
+  cmState::Snapshot GetStateSnapshot() const;
+
 protected:
   // add link libraries and directories to the target
   void AddGlobalLinkInformation(const std::string& name, cmTarget& target);