[clang] [PowerPC] Add missing vec_msum and vec_vmsumudm builtins for POWER9 (PR #221199)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp,c -- clang/test/SemaCXX/altivec-vec-msum-p9.cpp clang/lib/Headers/altivec.h clang/test/CodeGen/PowerPC/builtins-ppc-p9vector.c --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/altivec.h b/clang/lib/Headers/altivec.h
index 929189be0..44725538d 100644
--- a/clang/lib/Headers/altivec.h
+++ b/clang/lib/Headers/altivec.h
@@ -6081,9 +6081,10 @@ vec_msum(vector unsigned short __a, vector unsigned short __b,
 }
 
 #if defined(__POWER9_VECTOR__) && defined(__SIZEOF_INT128__)
-static __inline__ vector unsigned __int128 __ATTRS_o_ai
-vec_msum(vector unsigned long long __a, vector unsigned long long __b,
-         vector unsigned __int128 __c) {
+static __inline__ vector unsigned __int128
+    __ATTRS_o_ai vec_msum(vector unsigned long long __a,
+                          vector unsigned long long __b,
+                          vector unsigned __int128 __c) {
   return __builtin_altivec_vmsumudm(__a, __b, __c);
 }
 #endif

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https://github.com/llvm/llvm-project/pull/221199