[SystemZ] Fix __builtin_s390_vceq* inconsistency

The __builtin_s390_vceq* family of builtins currently take
signed arguments with clang, but unsigned with GCC.  Update
clang to match existing GCC precendent.

Author: uweigand

clang/include/clang/Basic/BuiltinsSystemZ.def

@@ -80,10 +80,10 @@ TARGET_BUILTIN(__builtin_s390_vavglb, "V16UcV16UcV16Uc", "nc", "vector")
 TARGET_BUILTIN(__builtin_s390_vavglh, "V8UsV8UsV8Us", "nc", "vector")
 TARGET_BUILTIN(__builtin_s390_vavglf, "V4UiV4UiV4Ui", "nc", "vector")
 TARGET_BUILTIN(__builtin_s390_vavglg, "V2ULLiV2ULLiV2ULLi", "nc", "vector")
-TARGET_BUILTIN(__builtin_s390_vceqbs, "V16ScV16ScV16Sci*", "nc", "vector")
-TARGET_BUILTIN(__builtin_s390_vceqhs, "V8SsV8SsV8Ssi*", "nc", "vector")
-TARGET_BUILTIN(__builtin_s390_vceqfs, "V4SiV4SiV4Sii*", "nc", "vector")
-TARGET_BUILTIN(__builtin_s390_vceqgs, "V2SLLiV2SLLiV2SLLii*", "nc", "vector")
+TARGET_BUILTIN(__builtin_s390_vceqbs, "V16ScV16UcV16Uci*", "nc", "vector")
+TARGET_BUILTIN(__builtin_s390_vceqhs, "V8SsV8UsV8Usi*", "nc", "vector")
+TARGET_BUILTIN(__builtin_s390_vceqfs, "V4SiV4UiV4Uii*", "nc", "vector")
+TARGET_BUILTIN(__builtin_s390_vceqgs, "V2SLLiV2ULLiV2ULLii*", "nc", "vector")
 TARGET_BUILTIN(__builtin_s390_vchbs, "V16ScV16ScV16Sci*", "nc", "vector")
 TARGET_BUILTIN(__builtin_s390_vchhs, "V8SsV8SsV8Ssi*", "nc", "vector")
 TARGET_BUILTIN(__builtin_s390_vchfs, "V4SiV4SiV4Sii*", "nc", "vector")