[lldb] Gate PolicyStack::Current() log behind verbose (#209527)

`Process::GetState()` calls `PolicyStack::Get().Current()` on every
prompt redraw, so the previous unconditional LLDB_LOG at the read site
fired on every keypress once `log enable lldb process` was on, drowning
out any other process log output. Keep the dump for when it's actually
wanted, but only fire it if the log is set to verbose.

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>
(cherry picked from commit c7a0afe5049a3d4789f34a8d746c6a45d73557b4)

lldb/source/Utility/Policy.cpp

@@ -25,10 +25,15 @@ PolicyStack &PolicyStack::Get() {
 
 Policy PolicyStack::Current() const {
   Policy p = m_stack.back();
+  // `Current()` is called on every read of the current policy (e.g. every
+  // `Process::GetState()`, itself called on every prompt redraw), so log
+  // only when verbose is set to avoid drowning out the process log.
   if (Log *log = GetLog(LLDBLog::Process)) {
-    StreamString s;
-    p.Dump(s);
-    LLDB_LOG(log, "{0}", s.GetData());
+    if (log->GetVerbose()) {
+      StreamString s;
+      p.Dump(s);
+      LLDB_LOG(log, "{0}", s.GetData());
+    }
   }
   return p;
 }