[clang] [lldb] [llvm] [llvm][TargetParser] Return optional from getHostCPUFeatures (PR #97824)

[Tomas Matheson via cfe-commits]

================
@@ -15,22 +15,23 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/TargetParser/Host.h"
 
+#include <optional>
+
 using namespace llvm;
 
 int main(int argc, char **argv) {
 #if defined(__i386__) || defined(_M_IX86) || \
     defined(__x86_64__) || defined(_M_X64)
-  StringMap<bool> features;
-
-  if (!sys::getHostCPUFeatures(features))
+  if (std::optional<StringMap<bool>> features =
+          sys::getHostCPUFeatures(features)) {
+    if ((*features)["sse"])
----------------
tmatheson-arm wrote:

Maybe
```suggestion
    if (features->lookup("sse"))
```
which does the same, but doesn't insert the default entry into the map.

https://github.com/llvm/llvm-project/pull/97824