[ObjC] Add pre-commit tests [NFC]

Author: AZero13

clang/test/CodeGenObjC/constant-non-fragile-ivar-offset.m

@@ -1,6 +1,13 @@
 // RUN: %clang_cc1 -triple x86_64-apple-macosx10.14.0 -emit-llvm %s -o - | FileCheck %s
 
 // CHECK: @"OBJC_IVAR_$_StaticLayout.static_layout_ivar" = hidden constant i64 20
+// CHECK: @"OBJC_IVAR_$_StaticLayoutSubClass.static_layout_ivar2" = hidden constant i64 24
+// CHECK: @"OBJC_IVAR_$_MyClass.myIvar" = constant i64 20
+// CHECK: @"OBJC_IVAR_$_MyClass._myProperty" = hidden constant i64 24
+// CHECK: @"OBJC_IVAR_$_AnotherClass.privateId" = constant i64 24
+// CHECK: @"OBJC_IVAR_$_AnotherClass.anotherPrivateId" = hidden constant i64 32
+// CHECK: @"OBJC_IVAR_$_SuperClass.superClassIvar" = constant i64 20
+// CHECK: @"OBJC_IVAR_$_SubClass.subClassIvar" = global i64 24
 // CHECK: @"OBJC_IVAR_$_NotStaticLayout.not_static_layout_ivar" = hidden global i64 12
 
 @interface NSObject {
@@ -20,6 +27,82 @@ -(void)meth {
 }
 @end
 
+// Scenario 1: Ivars declared in the @interface
+@interface MyClass : NSObject
+{
+    int myIvar; // Declare an ivar
+}
+
+@property (nonatomic, assign) int myProperty; // Synthesize a property
+
+@end
+
+@implementation MyClass 
+
+- (void)exampleMethod {
+    self.myProperty = 42; // Access the property
+    myIvar = 10; // Access the ivar directly
+}
+
+@end
+
+// Scenario 2: Ivars declared directly in the @implementation
+@interface AnotherClass : NSObject
+{
+  id privateId;
+}
+
+@end
+
+@implementation AnotherClass
+{
+    id anotherPrivateId; // Declare an ivar directly in the implementation
+}
+
+- (void)doSomething {
+   privateId = anotherPrivateId;
+}
+
+@end
+
+// Scenario 3: Inheritance and Ivars
+@interface SuperClass : NSObject
+{
+    int superClassIvar;
+}
+@end
+
+@implementation SuperClass
+@end
+
+@interface SubClass : SuperClass
+{
+    double subClassIvar;
+}
+@end
+
+@implementation SubClass
+- (void)exampleMethod {
+    // CHECK: load i64, ptr @"OBJC_IVAR_$SuperClass
+    superClassIvar = 100; // Access superclass ivar
+    subClassIvar = 3.14; // Access subclass ivar
+}
+@end
+
+// Scenario 4: Custom Getter/Setter Methods
+@interface CustomPropertyClass : NSObject
+@property (nonatomic, strong, getter=myCustomGetter, setter=myCustomSetter:) id customProperty;
+@end
+
+@implementation CustomPropertyClass
+- (id) myCustomGetter {
+    return 0;
+}
+
+- (void)myCustomSetter:(id)newValue {
+}
+@end
+
 @interface NotNSObject {
   int these, might, change;
 }