[Hexagon] Expand sext- and zextloads of vector types, not just extloads

Recent change exposed this issue, breaking the Hexagon buildbots.

llvm-svn: 280973
diff --git a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
index 8e113b9..34f553a 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
@@ -1968,9 +1968,13 @@
     for (unsigned VectExpOp : VectExpOps)
       setOperationAction(VectExpOp, VT, Expand);
 
-    // Expand all extended loads and truncating stores:
+    // Expand all extending loads and truncating stores:
     for (MVT TargetVT : MVT::vector_valuetypes()) {
+      if (TargetVT == VT)
+        continue;
       setLoadExtAction(ISD::EXTLOAD, TargetVT, VT, Expand);
+      setLoadExtAction(ISD::ZEXTLOAD, TargetVT, VT, Expand);
+      setLoadExtAction(ISD::SEXTLOAD, TargetVT, VT, Expand);
       setTruncStoreAction(VT, TargetVT, Expand);
     }