[TBAA] Test for tbaa.struct creation for struct with named bitfields.

Add test for tbaa.struct metadata creation for copies of a struct with
named bitfields.

Test for #82586.

Author: fhahn

clang/test/CodeGen/tbaa-struct.cpp

@@ -102,6 +102,23 @@ void copy7(A *a1, AA *a2) {
   *a1 = *a2;
 }
 
+struct NamedBitfields {
+   signed f0 : 9;
+   unsigned f1 : 2;
+   char f2;
+   double f3;
+};
+
+NamedBitfields g;
+
+void copy8(NamedBitfields *a1, NamedBitfields *a2) {
+// CHECK-LABEL: _Z5copy8P14NamedBitfieldsS0_
+// CHECK:   tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %a1, ptr noundef nonnull align 8 dereferenceable(16) %a2, i64 16, i1 false),
+// CHECK-OLD-SAME: !tbaa.struct [[TS6:!.*]]
+// CHECK-NEW-SAME: !tbaa [[TAG_NamedBitfields:!.+]], !tbaa.struct
+  *a1 = *a2;
+}
+
 // CHECK-OLD: [[TS]] = !{i64 0, i64 2, !{{.*}}, i64 4, i64 4, !{{.*}}, i64 8, i64 1, !{{.*}}, i64 12, i64 4, !{{.*}}}
 // CHECK-OLD: [[CHAR:!.*]] = !{!"omnipotent char", !{{.*}}}
 // CHECK-OLD: [[TAG_INT:!.*]] = !{[[INT:!.*]], [[INT]], i64 0}
@@ -113,6 +130,9 @@ void copy7(A *a1, AA *a2) {
 // CHECK-OLD: [[TS3]] = !{i64 0, i64 8, !{{.*}}, i64 0, i64 2, !{{.*}}, i64 4, i64 8, !{{.*}}}
 // CHECK-OLD: [[TS4]] = !{i64 0, i64 1, [[TAG_CHAR]], i64 1, i64 1, [[TAG_CHAR]], i64 2, i64 1, [[TAG_CHAR]]}
 // CHECK-OLD: [[TS5]] = !{i64 0, i64 1, [[TAG_CHAR]], i64 4, i64 1, [[TAG_CHAR]], i64 5, i64 1, [[TAG_CHAR]]}
+// CHECK-OLD: [[TS6]] = !{i64 0, i64 4, [[TAG_INT]], i64 1, i64 4, [[TAG_INT]], i64 2, i64 1, [[TAG_CHAR]], i64 8, i64 8, [[TAG_DOUBLE:!.+]]}
+// CHECK-OLD: [[TAG_DOUBLE]] = !{[[DOUBLE:!.+]], [[DOUBLE]], i64 0}
+// CHECK-OLD  [[DOUBLE]] = !{!"double", [[CHAR]], i64 0}
 
 // CHECK-NEW-DAG: [[TYPE_char:!.*]] = !{{{.*}}, i64 1, !"omnipotent char"}
 // CHECK-NEW-DAG: [[TAG_char]] = !{[[TYPE_char]], [[TYPE_char]], i64 0, i64 0}
@@ -127,3 +147,6 @@ void copy7(A *a1, AA *a2) {
 // CHECK-NEW-DAG: [[TAG_C]] = !{[[TYPE_C]], [[TYPE_C]], i64 0, i64 3}
 // CHECK-NEW-DAG: [[TYPE_D:!.*]] = !{[[TYPE_char]], i64 6, !"_ZTS1D", [[TYPE_char]], i64 0, i64 1, [[TYPE_char]], i64 4, i64 1, [[TYPE_char]], i64 5, i64 1}
 // CHECK-NEW-DAG: [[TAG_D]] = !{[[TYPE_D]], [[TYPE_D]], i64 0, i64 6}
+// CHECK-NEW-DAG: [[TAG_NamedBitfields]] = !{[[TYPE_NamedBitfields:!.+]], [[TYPE_NamedBitfields]], i64 0, i64 16}
+// CHECK-NEW-DAG: [[TYPE_NamedBitfields]] = !{[[TYPE_char]], i64 16, !"_ZTS14NamedBitfields", [[TYPE_int]], i64 0, i64 4, [[TYPE_int]], i64 1, i64 4, [[TYPE_char]], i64 2, i64 1, [[TYPE_double:!.+]], i64 8, i64 8}
+// CHECK-NEW-DAG: [[TYPE_double]] = !{[[TYPE_char]], i64 8, !"double"}