Skip two sub-tests on llvm 21.1 (#8782)

Tests in correctness_register_shuffle are broken due to llvm/llvm-project#126337

These are fixed by llvm/llvm-project#149393 but it is not included in LLVM 21.1.0

Hopefully they will include it in a later patch release of LLVM 21.

Author: abadams

test/correctness/register_shuffle.cpp

@@ -11,6 +11,10 @@ int main(int argc, char **argv) {
         return 0;
     }
 
+    // As 8/26/2025 llvm 21.1.0 includes some bugs w.r.t float32x2 vectors.
+    // See https://github.com/llvm/llvm-project/pull/126337#issuecomment-3192412599
+    const bool bad_llvm_version = Halide::Internal::get_llvm_version() == 211;
+
     {
         // Shuffle test to do a small convolution
         Func f, g;
@@ -93,7 +97,7 @@ int main(int argc, char **argv) {
         }
     }
 
-    {
+    if (!bad_llvm_version) {
         // Vectorized broadcast test. Each lane is responsible for a
         // 2-vector from 'a' and a 2-vector from 'b' instead of a single
         // value.
@@ -251,7 +255,7 @@ int main(int argc, char **argv) {
         }
     }
 
-    {
+    if (!bad_llvm_version) {
         // Bilinear upsample
         Func f, upx, upy;
         Var x, y;