Convert vperm2f128 and vperm2i128 intrinsics back to using llvm intrinsics. Unfortunately, these instructions have behavior that can't be modeled with shuffle vector.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154906 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/avx2-builtins.c b/test/CodeGen/avx2-builtins.c
index e56e55d..7d166b5 100644
--- a/test/CodeGen/avx2-builtins.c
+++ b/test/CodeGen/avx2-builtins.c
@@ -677,7 +677,7 @@
 }
 
 __m256i test_mm256_permute2x128_si256(__m256i a, __m256i b) {
-  // CHECK: shufflevector{{.*}}<i32 2, i32 3, i32 6, i32 7>
+  // CHECK: @llvm.x86.avx2.vperm2i128
   return _mm256_permute2x128_si256(a, b, 0x31);
 }