Fix crash walking call stack on Linux.

tools/gyp/configurations_make.gypi

Index: tools/gyp/configurations_make.gypi
diff --git a/tools/gyp/configurations_make.gypi b/tools/gyp/configurations_make.gypi
index 73d7350fafcebd4f10c6844c8b362c4f43cde10d..6ffc9206751a0fc8f4e240a60898545a27b76a96 100644
--- a/tools/gyp/configurations_make.gypi
+++ b/tools/gyp/configurations_make.gypi
@@ -93,6 +93,9 @@
           '-O<(dart_debug_optimization_level)',
           # The sampling profiler uses the frame pointer to walk the stack.
           '-fno-omit-frame-pointer',
+          # Clang on Linux will still omit frame pointers from leaf functions
+          # unless told otherwise:
+          # '-mno-omit-leaf-frame-pointer',
         ],
       },
 
@@ -101,6 +104,9 @@
           '-O3',
           # The sampling profiler uses the frame pointer to walk the stack.
           '-fno-omit-frame-pointer',
+          # Clang on Linux will still omit frame pointers from leaf functions
+          # unless told otherwise:
+          # '-mno-omit-leaf-frame-pointer',
         ],
       },
     },