[PATCH GCC]Document vect_cond_mixed in sourcebuild.texi

[Bin Cheng]

Hi,
This is an obvious patch documenting vect_cond_mixed in sourcebuild.texi.  OK?

Thanks,
bin

2016-05-13  bin cheng  <bin.ch...@arm.com>

        * doc/sourcebuild.texi (@item vect_cond_mixed): New item.
diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi
index 3142cd5..f1bd9be 100644
--- a/gcc/doc/sourcebuild.texi
+++ b/gcc/doc/sourcebuild.texi
@@ -1342,6 +1342,10 @@ Target supports Fortran @code{real} kinds larger than 
@code{real(8)}.
 @item vect_condition
 Target supports vector conditional operations.
 
+@item vect_cond_mixed
+Target supports vector conditional operations where comparison operands
+have different type from the value operands.
+
 @item vect_double
 Target supports hardware vectors of @code{double}.