[PATCH] Support/APFloat, fix assert on convertFromString(toString(infty))

[Duncan P. N. Exon Smith]

> On 2015-Mar-16, at 15:54, Johan Engelen <jbc.engelen at swissonline.ch> wrote:
> 
> Hello,
>  Here is a patch for /lib/Support/APFloat.cpp that fixes an assert when the output of APFloat::toString() is fed back into APFloat::convertFromString().
> 
> For infinity, toString() outputs a string with upper case "Inf", whereas convertFromString() only accepts lowercase "inf".
> 
> The patch adds "Inf" and "-Inf" to the accepted strings in convertFromString(), and modifies the output from toString() to "Inf" instead of "+Inf" for positive infinity.
> 
> Thanks,
>  Johan

Testcase?  I suggest something in unittests/ADT/APFloatTest.cpp.