Enable native stack walking for allocation profiling

runtime/bin/bin.gypi

Index: runtime/bin/bin.gypi
diff --git a/runtime/bin/bin.gypi b/runtime/bin/bin.gypi
index 00c9f69793f34b6efc6537a4e54a368475c21142..12dd8b489f32964e53b506295bba506e87211406 100644
--- a/runtime/bin/bin.gypi
+++ b/runtime/bin/bin.gypi
@@ -768,6 +768,15 @@
           },
         }],
       ],
+      'configurations': {
+        'Dart_Linux_Base': {
+          # Have the linker add all symbols to the dynamic symbol table
+          # so that extensions can look them up dynamically in the binary.
+          'ldflags': [
+            '-rdynamic',
+          ],
+        },
+      },
     },
     {
       'target_name': 'test_extension',