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

[hfinkel at anl.gov]

================
Comment at: lib/Driver/Tools.cpp:1662
@@ +1661,3 @@
+    // Ignore the '-' or optional '+' in string comparison.
+    bool IsNegative = (Val[0] == '-');
+    if (IsNegative)
----------------
spatel wrote:
> hfinkel wrote:
> > Why can these be negative?
> 'IsNegative' may just be a poor name choice. I followed the lead of similar code in this file and copied that name. 
> 
> The '-' prefix on an option means "disable this type of reciprocal".
> 
> Please let me know if I've misunderstood your question.
You did not misunderstand, but I agree, the naming is poor. Let's not replicate it. How about naming it IsDisabled?

http://reviews.llvm.org/D8989

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