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

[Jon Roelofs via llvm-commits]

================
@@ -355,6 +366,50 @@ static std::unique_ptr<ToolOutputFile> GetOutputStream(const char *TargetName,
   return FDOut;
 }
 
+static int MaybeEnableStats() {
+  if (SaveStats.getNumOccurrences() > 0) {
----------------
jroelofs wrote:

likewise: invert the condition so it can be an early return.

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