[ARM,AArch64] Over-sized bitfields affect unadjusted alignment

The container type picked for an over-sized bitfield already contributes
to the alignment of the structure, but it should also contribute to the
"unadjusted alignment" which is used by the ARM and AArch64 PCS.

Author: ostannard

clang/lib/AST/RecordLayoutBuilder.cpp

@@ -1523,6 +1523,7 @@ void ItaniumRecordLayoutBuilder::LayoutWideBitField(uint64_t FieldSize,
   setSize(std::max(getSizeInBits(), getDataSizeInBits()));
 
   // Remember max struct/class alignment.
+  UnadjustedAlignment = std::max(UnadjustedAlignment, TypeAlign);
   UpdateAlignment(TypeAlign);
 }
 

clang/test/CodeGen/aapcs-align.cpp

@@ -154,8 +154,8 @@ unsigned sizeof_OverSizedBitfield = sizeof(OverSizedBitfield);
 unsigned alignof_OverSizedBitfield = alignof(OverSizedBitfield);
 
 // CHECK: define{{.*}} void @g7
-// CHECK: call void @f7(i32 noundef 1, [2 x i32] [i32 42, i32 0])
-// CHECK: declare void @f7(i32 noundef, [2 x i32])
+// CHECK: call void @f7(i32 noundef 1, [1 x i64] [i64 42])
+// CHECK: declare void @f7(i32 noundef, [1 x i64])
 void f7(int a, OverSizedBitfield b);
 void g7() {
   OverSizedBitfield s = {42};
@@ -173,8 +173,8 @@ unsigned sizeof_VeryOverSizedBitfield = sizeof(VeryOverSizedBitfield);
 unsigned alignof_VeryOverSizedBitfield = alignof(VeryOverSizedBitfield);
 
 // CHECK: define{{.*}} void @g8
-// CHECK: call void @f8(i32 noundef 1, [4 x i32] [i32 42, i32 0, i32 0, i32 0])
-// CHECK: declare void @f8(i32 noundef, [4 x i32])
+// CHECK: call void @f8(i32 noundef 1, [2 x i64] [i64 42, i64 0])
+// CHECK: declare void @f8(i32 noundef, [2 x i64])
 void f8(int a, VeryOverSizedBitfield b);
 void g8() {
   VeryOverSizedBitfield s = {42};

clang/test/CodeGen/aapcs64-align.cpp

@@ -197,8 +197,8 @@ unsigned sizeof_VeryOverSizedBitfield = sizeof(VeryOverSizedBitfield);
 unsigned alignof_VeryOverSizedBitfield = alignof(VeryOverSizedBitfield);
 
 // CHECK: define{{.*}} void @g8
-// CHECK: call void @f8(i32 noundef 1, [2 x i64] [i64 42, i64 0])
-// CHECK: declare void @f8(i32 noundef, [2 x i64])
+// CHECK: call void @f8(i32 noundef 1, i128 42)
+// CHECK: declare void @f8(i32 noundef, i128)
 void f8(int a, VeryOverSizedBitfield b);
 void g8() {
   VeryOverSizedBitfield s = {42};