[llvm-symbolizer] Introduce the -dsym-hint option.

llvm-symbolizer will consult one of the .dSYM paths passed via -dsym-hint
if it fails to find the .dSYM bundle at the default location.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220004 91177308-0d34-0410-b5e6-96231b3b80d8

docs/CommandGuide/llvm-symbolizer.rst

@@ -92,6 +92,13 @@ OPTIONS
  input (see example above). If architecture is not specified in either way,
  address will not be symbolized. Defaults to empty string.
 
+.. option:: -dsym-hint=<path/to/file.dSYM>
+
+ (Darwin-only flag). If the debug info for a binary isn't present in the default
+ location, look for the debug info at the .dSYM path provided via the
+ ``-dsym-hint`` flag. This flag can be used multiple times.
+
+
 EXIT STATUS
 -----------