[SLP][NFC]Add a test with the incorrect vectorization for the pointers with distance difference > 2^32

Author: alexey-bataev

llvm/test/Transforms/SLPVectorizer/X86/long-pointer-distance.ll

@@ -0,0 +1,21 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S --passes=slp-vectorizer -mtriple=x86_64-grtev4-linux-gnu < %s -mattr=+avx | FileCheck %s
+
+define void @test(ptr %this) {
+; CHECK-LABEL: define void @test(
+; CHECK-SAME: ptr [[THIS:%.*]]) #[[ATTR0:[0-9]+]] {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    store <4 x i64> <i64 1, i64 2, i64 3, i64 4>, ptr [[THIS]], align 8
+; CHECK-NEXT:    ret void
+;
+entry:
+  store i64 1, ptr %this, align 8
+  %b = getelementptr i8, ptr %this, i64 8
+  store i64 2, ptr %b, align 8
+  %c = getelementptr i8, ptr %this, i64 u0x100000010
+  store i64 3, ptr %c, align 8
+  %d = getelementptr i8, ptr %this, i64 u0x100000018
+  store i64 4, ptr %d, align 8
+  ret void
+}
+