Add tools/mac/show_mod_init_func.py to symbolize static initializers without a dSYM.

tools/mac/dump-static-initializers.py

Index: tools/mac/dump-static-initializers.py
diff --git a/tools/mac/dump-static-initializers.py b/tools/mac/dump-static-initializers.py
index 3a2c125062dab52f2b1941d3eafb14d40633560a..339cd440ecdfe64b6888fae65866be74464a3bc1 100755
--- a/tools/mac/dump-static-initializers.py
+++ b/tools/mac/dump-static-initializers.py
@@ -7,10 +7,13 @@
 Dumps a list of files with static initializers. Use with release builds.
 
 Usage:
-  tools/mac/dump-static-initializers.py out/Release/Chromium\ Framework.framework.dSYM/Contents/Resources/DWARF/Chromium\ Framework 
+  tools/mac/dump-static-initializers.py out/Release/Chromium\ Framework.framework.dSYM/Contents/Resources/DWARF/Chromium\ Framework
 
 Do NOT use mac_strip_release=0 or component=shared_library if you want to use
 this script.
+
+This is meant to be used on a dSYM file. If only an unstripped executable is
+present, use show_mod_init_func.py.
 """
 
 import optparse