cmMakefile: Replace GetExecutionFilePath with the top of the Backtrace

The execution file path stack and the backtrace stack are kept in sync.
At all call sites of `GetExecutionFilePath`, the execution file path
matches the path in the context at the top of the backtrace stack.

Source/cmMakefile.cxx

@@ -279,7 +279,7 @@ void cmMakefile::PrintCommandTrace(const cmListFileFunction& lff) const
   // Check if current file in the list of requested to trace...
   std::vector<std::string> const& trace_only_this_files =
     this->GetCMakeInstance()->GetTraceSources();
-  std::string const& full_path = this->GetExecutionFilePath();
+  std::string const& full_path = this->GetBacktrace().Top().FilePath;
   std::string const& only_filename = cmSystemTools::GetFilenameName(full_path);
   bool trace = trace_only_this_files.empty();
   if (!trace) {
@@ -578,7 +578,7 @@ void cmMakefile::IncludeScope::EnforceCMP0011()
         std::ostringstream w;
         w << cmPolicies::GetPolicyWarning(cmPolicies::CMP0011) << "\n"
           << "The included script\n  "
-          << this->Makefile->GetExecutionFilePath() << "\n"
+          << this->Makefile->GetBacktrace().Top().FilePath << "\n"
           << "affects policy settings.  "
           << "CMake is implying the NO_POLICY_SCOPE option for compatibility, "
           << "so the effects are applied to the including context.";
@@ -591,7 +591,7 @@ void cmMakefile::IncludeScope::EnforceCMP0011()
       /* clang-format off */
       e << cmPolicies::GetRequiredPolicyError(cmPolicies::CMP0011) << "\n"
         << "The included script\n  "
-        << this->Makefile->GetExecutionFilePath() << "\n"
+        << this->Makefile->GetBacktrace().Top().FilePath << "\n"
         << "affects policy settings, so it requires this policy to be set.";
       /* clang-format on */
       this->Makefile->IssueMessage(MessageType::FATAL_ERROR, e.str());
@@ -3328,16 +3328,10 @@ bool cmMakefile::IsLoopBlock() const
   return !this->LoopBlockCounter.empty() && this->LoopBlockCounter.top() > 0;
 }
 
-std::string const& cmMakefile::GetExecutionFilePath() const
-{
-  assert(this->StateSnapshot.IsValid());
-  return this->StateSnapshot.GetExecutionListFile();
-}
-
 bool cmMakefile::ExpandArguments(std::vector<cmListFileArgument> const& inArgs,
                                  std::vector<std::string>& outArgs) const
 {
-  std::string const& filename = this->GetExecutionFilePath();
+  std::string const& filename = this->GetBacktrace().Top().FilePath;
   std::string value;
   outArgs.reserve(inArgs.size());
   for (cmListFileArgument const& i : inArgs) {
@@ -3366,7 +3360,7 @@ bool cmMakefile::ExpandArguments(
   std::vector<cmListFileArgument> const& inArgs,
   std::vector<cmExpandedCommandArgument>& outArgs) const
 {
-  std::string const& filename = this->GetExecutionFilePath();
+  std::string const& filename = this->GetBacktrace().Top().FilePath;
   std::string value;
   outArgs.reserve(inArgs.size());
   for (cmListFileArgument const& i : inArgs) {

Source/cmMakefile.h

@@ -937,8 +937,6 @@ public:
 
   const char* GetDefineFlagsCMP0059() const;
 
-  std::string const& GetExecutionFilePath() const;
-
   void EnforceDirectoryLevelRules() const;
 
   void AddEvaluationFile(