[lldb] Print mangled names with verbose break list (llvm#84071)

When debugging LLDB itself, it can often be useful to know the mangled
name of the function where a breakpoint is set. Since the `--verbose`
setting of `break --list` is aimed at debugging LLDB, this patch makes
it so that the mangled name is also printed in that mode.

Note about testing: since mangling is not the same on Windows and Linux,
the test refrains from hardcoding mangled names.

Author: felipepiovezan

lldb/source/Breakpoint/BreakpointLocation.cpp

@@ -524,6 +524,12 @@ void BreakpointLocation::GetDescription(Stream *s,
           s->EOL();
           s->Indent("function = ");
           s->PutCString(sc.function->GetName().AsCString("<unknown>"));
+          if (ConstString mangled_name =
+                  sc.function->GetMangled().GetMangledName()) {
+            s->EOL();
+            s->Indent("mangled function = ");
+            s->PutCString(mangled_name.AsCString());
+          }
         }
 
         if (sc.line_entry.line > 0) {

lldb/test/API/functionalities/breakpoint/breakpoint_options/TestBreakpointOptions.py

@@ -82,14 +82,25 @@ def breakpoint_options_language_test(self):
         self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
 
         # This should create a breakpoint with 1 locations.
-        lldbutil.run_break_set_by_symbol(
+        bp_id = lldbutil.run_break_set_by_symbol(
             self,
             "ns::func",
             sym_exact=False,
             extra_options="-L c++",
             num_expected_locations=1,
         )
 
+        location = self.target().FindBreakpointByID(bp_id).GetLocationAtIndex(0)
+        function = location.GetAddress().GetFunction()
+        self.expect(
+            "breakpoint list -v",
+            "Verbose breakpoint list contains mangled names",
+            substrs=[
+                "function = ns::func",
+                f"mangled function = {function.GetMangledName()}",
+            ],
+        )
+
         # This should create a breakpoint with 0 locations.
         lldbutil.run_break_set_by_symbol(
             self,