[PATCH] add the -mrecip driver flag and process its options

[hfinkel at anl.gov]

================
Comment at: lib/Driver/Tools.cpp:1633
@@ +1632,3 @@
+    D.Diag(diag::err_drv_argument_not_allowed_with)
+      << A->getOption().getName() << "Too many options specified.";
+  }
----------------
You should either accept duplicates, or provide a specific error on the duplicated keys. Don't just complain about the number, that's not informative.


================
Comment at: lib/Driver/Tools.cpp:1662
@@ +1661,3 @@
+    // Ignore the '-' or optional '+' in string comparison.
+    bool IsNegative = (Val[0] == '-');
+    if (IsNegative)
----------------
Why can these be negative?

http://reviews.llvm.org/D8989

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