Add tests with the argument passed in memory and union types with pointer members.

Author: lei137

clang/test/CodeGen/transparent-union-type.c

@@ -52,6 +52,13 @@ void ftest0(tu_c_t uc) { }
 // CHECK-NEXT:    ret void
 void ftest1(tu_s_t uc) { }
 
+// CHECK-LABEL: define{{.*}} void @ftest1b(
+// CHECK-SAME: ptr nocapture noundef readnone [[UC:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    ret void
+//
+void ftest1b(tu_s_t *uc) { }
+
 // CHECK-LABEL: define{{.*}} void @ftest2(
 // CHECK-SAME: i16 noundef zeroext [[UC_COERCE:%.*]]) local_unnamed_addr #[[ATTR0]] {
 // CHECK-NEXT:  [[ENTRY:.*:]]
@@ -79,3 +86,23 @@ typedef union etest {
 // CHECK-NEXT:  [[ENTRY:.*:]]
 // CHECK-NEXT:    ret void
 void ftest4(etest_t a) {}
+
+typedef union tu_ptr {
+  signed char *a;
+  unsigned short *b;
+  int *c;
+} tu_ptr_t __attribute__((transparent_union));
+
+// CHECK-LABEL: define{{.*}} void @ftest5(
+// CHECK-SAME: ptr nocapture readnone [[UC_COERCE:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    ret void
+//
+void ftest5(tu_ptr_t uc) { }
+
+// CHECK-LABEL: define{{.*}} void @ftest6(
+// CHECK-SAME: ptr nocapture noundef readnone [[UC:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    ret void
+//
+void ftest6(tu_ptr_t *uc) { }