Regex: deallocate Saves memory on ThreadedRegexVM destruction

src/regex_impl.cc

@@ -883,7 +883,6 @@ struct TestVM : CompiledRegex, ThreadedRegexVM<const char*, dir>
 }
 
 auto test_regex = UnitTest{[]{
-
     {
         TestVM<> vm{R"(a*b)"};
         kak_assert(vm.exec("b"));

src/regex_impl.hh

@@ -118,6 +118,7 @@ public:
             for (size_t i = m_program.save_count-1; i > 0; --i)
                 saves->pos[i].~Iterator();
             saves->~Saves();
+            ::operator delete(saves, sizeof(Saves) + (m_program.save_count-1) * sizeof(Iterator));
         }
     }