[BasicAA] Add pre-commit tests for PR69096. NFC.

Author: dtcxzyw

llvm/test/Analysis/BasicAA/pr69096.ll

@@ -0,0 +1,31 @@
+; RUN: opt %s -aa-pipeline=basic-aa -passes=aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
+
+target datalayout = "p:64:64:64"
+
+; CHECK-LABEL: Function: pr69096
+; FIXME: This should be MayAlias. %p == %scevgep.i when %a == -1.
+; CHECK: NoAlias:     i8* %p, i16* %scevgep.i
+
+define i32 @pr69096(i16 %a, ptr %p) {
+entry:
+  %0 = load i8, ptr %p, align 2
+  %dec.i = add i8 %0, -1
+  %cmp636.i = icmp eq i16 %a, -1
+  br i1 %cmp636.i, label %for.cond2.for.inc29_crit_edge.i, label %n.exit
+
+for.cond2.for.inc29_crit_edge.i:
+  %conv3.i = zext i16 %a to i64
+  %sub.i.i = shl i64 %conv3.i, 56
+  %sub21.i = shl nuw nsw i64 %conv3.i, 2
+  %1 = getelementptr i8, ptr %p, i64 %sub21.i
+  %2 = getelementptr i8, ptr %1, i64 -262140
+  %3 = getelementptr i8, ptr %2, i64 %sub.i.i
+  %scevgep.i = getelementptr i8, ptr %3, i64 72057594037927936
+  store i16 1285, ptr %scevgep.i, align 2
+  br label %n.exit
+
+n.exit:
+  %4 = load i8, ptr %p, align 2
+  %conv = sext i8 %4 to i32
+  ret i32 %conv
+}