[gn] build lldb-test with dead code stripping

Needed as a workaround for
llvm#96985 (review)

Hopefully this will be resolved soon and we can remove this again.

Author: nico

llvm/utils/gn/secondary/lldb/tools/lldb-test/BUILD.gn

@@ -26,4 +26,12 @@ executable("lldb-test") {
     "SystemInitializerTest.cpp",
     "lldb-test.cpp",
   ]
+
+  if (current_os == "mac") {
+    ldflags = [ "-Wl,-dead_strip" ]
+  } else if (current_os == "win") {
+    ldflags = [ "/OPT:REF" ]
+  } else {
+    ldflags = [ "-Wl,--gc-sections" ]
+  }
 }