[vecz] Update some lit tests to account for LLVM 17

* LLVM 17 started introducing new NaNs during a fold.
* LLVM 17 saw the internal 'undef' global variable, and wasn't
  vectorizing as it determined its users to also be undef, which makes
  sense.

Author: frasercrmck

llvm/lib/SYCLNativeCPUUtils/compiler_passes/vecz/test/lit/llvm/ScalableVectors/broadcast_vector.ll

@@ -15,7 +15,6 @@
 ; SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 ; NOTE: Assertions have been autogenerated by scripts/testing/update_veczc_checks.py
-; REQUIRES: llvm-13+
 ; RUN: veczc -vecz-scalable -vecz-simd-width=4 -S < %s | FileCheck %s
 
 target triple = "spir64-unknown-unknown"
@@ -29,7 +28,7 @@ entry:
   %arrayidx = getelementptr inbounds <4 x float>, <4 x float> addrspace(1)* %in, i64 %call
   %0 = bitcast <4 x float> addrspace(1)* %arrayidx to <4 x float> addrspace(1)*
   %1 = load <4 x float>, <4 x float> addrspace(1)* %0, align 16
-  %2 = fadd <4 x float> %1, <float 0x7FF0000020000000, float 0x7FF0000020000000, float 0x7FF0000020000000, float 0x7FF0000020000000>
+  %2 = fadd <4 x float> %1, <float 0x7FF8000020000000, float 0x7FF8000020000000, float 0x7FF8000020000000, float 0x7FF8000020000000>
   %arrayidx3 = getelementptr inbounds <4 x float>, <4 x float> addrspace(1)* %out, i64 %call
   store <4 x float> %2, <4 x float> addrspace(1)* %arrayidx3, align 16
   ret void
@@ -102,7 +101,7 @@ entry:
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[CALL:%.*]] = tail call spir_func i64 @_Z13get_global_idj(i32 0)
 ; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds <4 x float>, ptr addrspace(1) [[OUT:%.*]], i64 [[CALL]]
-; CHECK-NEXT:    store <vscale x 16 x float> shufflevector (<vscale x 16 x float> insertelement (<vscale x 16 x float> {{(undef|poison)}}, float 0x7FF0000020000000, {{(i32|i64)}} 0), <vscale x 16 x float> {{(undef|poison)}}, <vscale x 16 x i32> zeroinitializer), ptr addrspace(1) [[ARRAYIDX3]], align 16
+; CHECK-NEXT:    store <vscale x 16 x float> shufflevector (<vscale x 16 x float> insertelement (<vscale x 16 x float> {{(undef|poison)}}, float 0x7FF8000020000000, {{(i32|i64)}} 0), <vscale x 16 x float> {{(undef|poison)}}, <vscale x 16 x i32> zeroinitializer), ptr addrspace(1) [[ARRAYIDX3]], align 16
 ; CHECK-NEXT:    ret void
 
 ; CHECK-LABEL: @__vecz_nxv4_vector_broadcast(

llvm/lib/SYCLNativeCPUUtils/compiler_passes/vecz/test/lit/llvm/contiguous_allocas.ll

@@ -20,7 +20,7 @@
 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "spir64-unknown-unknown"
 
-@entry_test_alloca.lm = internal unnamed_addr addrspace(3) constant [16 x <2 x float>] undef, align 8
+@entry_test_alloca.lm = external unnamed_addr addrspace(3) constant [16 x <2 x float>], align 8
 
 define spir_kernel void @test(<2 x float> addrspace(1)* nocapture readonly %in, <2 x float> addrspace(1)* nocapture %out, i32 %offset) local_unnamed_addr {
 entry:

llvm/lib/SYCLNativeCPUUtils/compiler_passes/vecz/test/lit/llvm/overaligned_allocas.ll

@@ -20,7 +20,7 @@
 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "spir64-unknown-unknown"
 
-@entry_test_alloca.lm = internal unnamed_addr addrspace(3) constant [16 x <2 x float>] undef, align 8
+@entry_test_alloca.lm = external unnamed_addr addrspace(3) constant [16 x <2 x float>], align 8
 
 define spir_kernel void @test(<2 x float> addrspace(1)* nocapture readonly %in, <2 x float> addrspace(1)* nocapture %out, i32 %offset) local_unnamed_addr {
 entry: