[Attributor] Add pre-commit tests

Author: elhewaty

llvm/test/Transforms/Attributor/remove_out_args.ll

@@ -0,0 +1,16 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S -passes=attributor < %s | FileCheck %s
+
+
+
+define i1 @foo(ptr %dst) {
+; CHECK-LABEL: define noundef i1 @foo(
+; CHECK-SAME: ptr nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[DST:%.*]]) #[[ATTR0:[0-9]+]] {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    store i32 42, ptr [[DST]], align 4
+; CHECK-NEXT:    ret i1 true
+;
+entry:
+  store i32 42, ptr %dst
+  ret i1 1
+}