libclc: Rename [add|sub]_sat.ll to [add|sub]_sat_if.ll

configure.py allows overloading *.cl with *.ll, but will only ever build
the first file listed in SOURCES of ${file}.cl and ${file}.ll

add_sat, sub_sat, (and the soon to be submitted clz) all define interfaces in
${function_name}.ll which are implemented in ${function_name}_impl.ll.

Renaming the interface files is enough to get them to build again, fixing
CL usage of these functions.

Tested on clover/r600g.

Patch by: Aaron Watry

llvm-svn: 185000

libclc/generic/lib/SOURCES

@@ -6,11 +6,11 @@ geometric/normalize.cl
 integer/abs.cl
 integer/abs_diff.cl
 integer/add_sat.cl
-integer/add_sat.ll
+integer/add_sat_if.ll
 integer/add_sat_impl.ll
 integer/rotate.cl
 integer/sub_sat.cl
-integer/sub_sat.ll
+integer/sub_sat_if.ll
 integer/sub_sat_impl.ll
 math/fmax.cl
 math/fmin.cl

libclc/ptx/lib/OVERRIDES

@@ -0,0 +1,2 @@
+integer/add_sat_if.ll
+integer/sub_sat_if.ll