[AIX] Support two itanium alignment LIT testcases for AIX using regex

[Xiangling_L]

Summary

AIX has different layout dumping format from other itanium abis.
And for these two cases, use regex to match AIX format.

[hubert.reinterpretcast]

Can we use a regex to make this also work in AIX?

[Xiangling_L]

In D89064#2320133, @hubert.reinterpretcast wrote:

Can we use a regex to make this also work in AIX?

Sure we can also do that. May I ask is that because we prefer letting AIX support as many LIT testcases as possible?

[hubert.reinterpretcast]

In D89064#2322717, @Xiangling_L wrote:

In D89064#2320133, @hubert.reinterpretcast wrote:

Can we use a regex to make this also work in AIX?

Sure we can also do that. May I ask is that because we prefer letting AIX support as many LIT testcases as possible?

Yes. In particular, if there was a reason for these cases to get expanded in the future, we'd like AIX to be tested as well.

[Xiangling_L]

Use regex to match AIX layout dumping format.

[hubert.reinterpretcast]

LGTM with suggestion.

clang/test/Layout/itanium-pack-and-align.cpp

19–20

If it works, use ? in place of *. Do also for all of the other cases.

clang/test/Layout/itanium-pack-and-align.cpp

struct alignas(8) T {
   int y;
 } __attribute__((packed));
 
 S s;
 T t;
 // CHECK:          0 | struct T
 // CHECK-NEXT:          0 |   char x
 // CHECK-NEXT:          1 |   int y
-// CHECK-NEXT:            | [sizeof=8, dsize=8, align=8,
-// CHECK-NEXT:            |  nvsize=8, nvalign=8]
+// CHECK-NEXT:            | [sizeof=8, dsize=8, align=8,{{( preferredalign=8,)?}}
+// CHECK-NEXT:            |  nvsize=8, nvalign=8{{(, preferrednvalign=8)?}}]
 
 // CHECK:          0 | struct S
 // CHECK-NEXT:          0 |   char x
 // CHECK-NEXT:          1 |   int y
-// CHECK-NEXT:            | [sizeof=8, dsize=8, align=8,
-// CHECK-NEXT:            |  nvsize=8, nvalign=8]
+// CHECK-NEXT:            | [sizeof=8, dsize=8, align=8,{{( preferredalign=8,)?}}
+// CHECK-NEXT:            |  nvsize=8, nvalign=8{{(, preferrednvalign=8)?}}]

clang/test/Layout/itanium-union-bitfield.cpp

union B {
   B();
 };
 
 B::B() {}
 
 // CHECK:*** Dumping AST Record Layout
 // CHECK-NEXT:     0 | union A
 // CHECK-NEXT: 0:0-2 |   int f1
-// CHECK-NEXT:       | [sizeof=4, dsize=1, align=4
-// CHECK-NEXT:       |  nvsize=1, nvalign=4]
+// CHECK-NEXT:       | [sizeof=4, dsize=1, align=4{{(, preferredalign=4,)?}}
+// CHECK-NEXT:       |  nvsize=1, nvalign=4{{(, preferrednvalign=4)?}}]
 
 // CHECK:*** Dumping AST Record Layout
 // CHECK-NEXT:      0 | union B
 // CHECK-NEXT: 0:0-34 |   char f1
-// CHECK-NEXT:        | [sizeof=8, dsize=5, align=4
-// CHECK-NEXT:        |  nvsize=5, nvalign=4]
-
+// CHECK-NEXT:        | [sizeof=8, dsize=5, align=4{{(, preferredalign=4,)?}}
+// CHECK-NEXT:        |  nvsize=5, nvalign=4{{(, preferrednvalign=4)?}}]