[LoongArch][Clang] Make the parameter and return value of {x,}vmsknz.b builtins signed char vector (#114511)

These builtins operate on int8 vectors, not int16 vectors.  So the old
definition does not make any sense.

Depends on #114510.  Part of #110834 fix.

(cherry picked from commit 92daad2)

Author: xry111

clang/include/clang/Basic/BuiltinsLoongArchLASX.def

@@ -357,7 +357,7 @@ TARGET_BUILTIN(__builtin_lasx_xvmskltz_w, "V8iV8i", "nc", "lasx")
 TARGET_BUILTIN(__builtin_lasx_xvmskltz_d, "V4LLiV4LLi", "nc", "lasx")
 
 TARGET_BUILTIN(__builtin_lasx_xvmskgez_b, "V32ScV32Sc", "nc", "lasx")
-TARGET_BUILTIN(__builtin_lasx_xvmsknz_b, "V16sV16s", "nc", "lasx")
+TARGET_BUILTIN(__builtin_lasx_xvmsknz_b, "V32ScV32Sc", "nc", "lasx")
 
 TARGET_BUILTIN(__builtin_lasx_xvldi, "V4LLiIi", "nc", "lasx")
 TARGET_BUILTIN(__builtin_lasx_xvrepli_b, "V32ScIi", "nc", "lasx")

clang/include/clang/Basic/BuiltinsLoongArchLSX.def

@@ -341,7 +341,7 @@ TARGET_BUILTIN(__builtin_lsx_vmskltz_w, "V4iV4i", "nc", "lsx")
 TARGET_BUILTIN(__builtin_lsx_vmskltz_d, "V2LLiV2LLi", "nc", "lsx")
 
 TARGET_BUILTIN(__builtin_lsx_vmskgez_b, "V16ScV16Sc", "nc", "lsx")
-TARGET_BUILTIN(__builtin_lsx_vmsknz_b, "V8sV8s", "nc", "lsx")
+TARGET_BUILTIN(__builtin_lsx_vmsknz_b, "V16ScV16Sc", "nc", "lsx")
 
 TARGET_BUILTIN(__builtin_lsx_vldi, "V2LLiIi", "nc", "lsx")
 TARGET_BUILTIN(__builtin_lsx_vrepli_b, "V16ScIi", "nc", "lsx")