[llvm] [tools][llc] Add `--save-stats` option (PR #163967)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/tools/llc/llc.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/tools/llc/llc.cpp b/llvm/tools/llc/llc.cpp
index c3fabc7cc..259f07ab3 100644
--- a/llvm/tools/llc/llc.cpp
+++ b/llvm/tools/llc/llc.cpp
@@ -211,11 +211,7 @@ static cl::opt<std::string> RemarksFormat(
     cl::desc("The format used for serializing remarks (default: YAML)"),
     cl::value_desc("format"), cl::init("yaml"));
 
-enum SaveStatsMode {
-  None,
-  Cwd,
-  Obj
-};
+enum SaveStatsMode { None, Cwd, Obj };
 
 static cl::opt<SaveStatsMode> SaveStats(
     "save-stats",
@@ -224,8 +220,7 @@ static cl::opt<SaveStatsMode> SaveStats(
              "file (`-save-stats=obj`). (default: cwd)"),
     cl::values(clEnumValN(SaveStatsMode::Cwd, "cwd",
                           "Save to the current working directory"),
-               clEnumValN(SaveStatsMode::Cwd, "",
-                          ""),
+               clEnumValN(SaveStatsMode::Cwd, "", ""),
                clEnumValN(SaveStatsMode::Obj, "obj",
                           "Save to the output file directory")),
     cl::init(SaveStatsMode::None), cl::ValueOptional);
@@ -396,14 +391,14 @@ static int MaybeSaveStats(std::string &&OutputFilename) {
   if (SaveStats == SaveStatsMode::None) {
     return 0;
   }
-  
+
   SmallString<128> StatsFilename;
   if (SaveStats == SaveStatsMode::Obj) {
     StatsFilename = OutputFilename;
     llvm::sys::path::remove_filename(StatsFilename);
   } else {
     assert((SaveStats == SaveStatsMode::Cwd) &&
-            "Should have been a valid --save-stats value");
+           "Should have been a valid --save-stats value");
   }
 
   auto BaseName = llvm::sys::path::filename(OutputFilename);
@@ -419,7 +414,7 @@ static int MaybeSaveStats(std::string &&OutputFilename) {
         << "Unable to open statistics file: " << EC.message() << "\n";
     return 1;
   }
-  
+
   llvm::PrintStatisticsJSON(*StatsOS);
   return 0;
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/163967