Always allow scalars for pre-llvm16

.

Author: igorban-intel

IGC/VectorCompiler/lib/GenXCodeGen/GenXAddressCommoning.cpp

@@ -1007,7 +1007,13 @@ bool GenXAddressCommoning::vectorizeAddrsFromOneVector(
         auto ui = OldConv->use_begin();
         auto user = cast<Instruction>(ui->getUser());
         auto NewExtract = R2.createRdRegion(NewConv, OldConv->getName(), user,
-            user->getDebugLoc(), /*ScalarAllowed=*/!OldConv->getType()->isVectorTy());
+                                            user->getDebugLoc(),
+#if LLVM_VERSION_MAJOR < 16
+                                            /*ScalarAllowed=*/true);
+#else
+                                            /*ScalarAllowed=*/
+                                            !OldConv->getType()->isVectorTy());
+#endif
         Numbering->setNumber(NewExtract, Numbering->getNumber(user));
         // At this late stage, I believe nothing relies on the baling type for
         // this instruction being set to RDREGION, but we set it anyway for

IGC/VectorCompiler/test/GenXAddressCommoning/rdregion_reduce.ll

@@ -9,6 +9,7 @@
 ; RUN: %opt_opaque_ptrs %use_old_pass_manager% -GenXModule -GenXLiveRangesWrapper \
 ; RUN:  -GenXAddressCommoningWrapper -march=genx64 -mtriple=spir64-unknown-unknown \
 ; RUN:  -mcpu=Gen9 -S < %s | FileCheck %s
+; REQUIRES: llvm_16_or_greater
 
 target datalayout = "e-p:64:64-p3:32:32-p6:32:32-i64:64-n8:16:32:64"
 target triple = "spir64-unknown-unknown"