[DAG] Precommit test case for or disjoint flag.

Author: fengfeng09

llvm/test/CodeGen/AArch64/apply-disjoint-flag-in-dagcombine.ll

@@ -0,0 +1,15 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=aarch64-none-eabi -verify-machineinstrs %s  -start-before=aarch64-isel -o - | FileCheck %s
+
+define i32 @test(i32 %a) {
+; CHECK-LABEL: test:
+; CHECK:       // %bb.0: // %entry
+; CHECK-NEXT:    add w8, w0, #1
+; CHECK-NEXT:    orr w0, w8, #0xc0
+; CHECK-NEXT:    ret
+entry:
+  %add = add i32 %a, 1
+  %or1 = or disjoint i32 %add, 64
+  %or = or disjoint i32 %or1, 128
+  ret i32 %or
+}