[NewGVN] Add test to ensure metadata is preserved for ssa_copy (NFC)

Add a new test that checks that metadata is preserved when ssa_copy
calls introduced by PredicateInfo are replaced by their original
values.

llvm/test/Transforms/NewGVN/preserve-metadata-for-predicate-replacements.ll

@@ -0,0 +1,61 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -newgvn %s -S | FileCheck %s
+
+declare void @use(i32)
+
+; Make sure !tbaa metadata is preserved when only ssa_copy calls introduced by
+; PredicateInfo are replaced.
+
+define i32 @test(i32* %p1, i32* %p2, i1 %c) {
+; CHECK-LABEL: @test(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[P1:%.*]], align 8, !tbaa !0
+; CHECK-NEXT:    [[CMP_1:%.*]] = icmp slt i32 [[LV]], 1
+; CHECK-NEXT:    br i1 [[CMP_1]], label [[EXIT:%.*]], label [[IF_FALSE:%.*]]
+; CHECK:       if.false:
+; CHECK-NEXT:    br i1 [[C:%.*]], label [[EXIT]], label [[FOR_CHECK:%.*]]
+; CHECK:       for.check:
+; CHECK-NEXT:    [[CMP_2:%.*]] = icmp sgt i32 [[LV]], 0
+; CHECK-NEXT:    br i1 [[CMP_2]], label [[FOR_PH:%.*]], label [[EXIT]]
+; CHECK:       for.ph:
+; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
+; CHECK:       for.body:
+; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 0, [[FOR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
+; CHECK-NEXT:    call void @use(i32 [[IV]])
+; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
+; CHECK-NEXT:    [[CMP_3:%.*]] = icmp ne i32 [[IV_NEXT]], [[LV]]
+; CHECK-NEXT:    br i1 [[CMP_3]], label [[FOR_BODY]], label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret i32 [[LV]]
+;
+entry:
+  %lv = load i32, i32* %p1, align 8, !tbaa !0
+  %cmp.1 = icmp slt i32 %lv, 1
+  br i1 %cmp.1, label %exit, label %if.false
+
+if.false:                                         ; preds = %entry
+  br i1 %c, label %exit, label %for.check
+
+for.check:                                        ; preds = %if.false
+  %cmp.2 = icmp sgt i32 %lv, 0
+  br i1 %cmp.2, label %for.ph, label %exit
+
+for.ph:                                           ; preds = %for.check
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %for.ph
+  %iv = phi i32 [ 0, %for.ph ], [ %iv.next, %for.body ]
+  call void @use(i32 %iv)
+  %iv.next = add nuw nsw i32 %iv, 1
+  %cmp.3 = icmp ne i32 %iv.next, %lv
+  br i1 %cmp.3, label %for.body, label %exit
+
+exit:                                            ; preds = %for.body, %for.check, %if.false, %entry
+  ret i32 %lv
+}
+
+!0 = !{!1, !2, i64 0}
+!1 = !{!"FULL", !2, i64 0, !2, i64 4, !3, i64 8}
+!2 = !{!"int", !3, i64 0}
+!3 = !{!"omnipotent char", !4, i64 0}
+!4 = !{!"Simple C/C++ TBAA"}