Native: enable lazy IR generation before running fake override builder

^KT-48816 Fixed

Native compiler uses lazy IR for declarations provided by cinterop.
The problem: `FakeOverrideBuilder` requests super types during
type checking, accessing `.owner` for them. So if a type and super type
are represented as lazy IR, and lazy IR generation is not enabled yet,
then the super type symbol won't be bound by this moment, and the access
will fail.

This happens in KT-48816: fake override builder tries to access `.owner`
for `IrClassSymbol` of `NSObject` (super type of `NSDate` and `NSUUID`).

Fix this by enabling lazy IR generation before building fake overrides.

kotlin-native/backend.native/tests/build.gradle

@@ -4327,6 +4327,10 @@ if (PlatformInfo.isAppleTarget(project)) {
         it.defFile 'interop/objc/kt42172/objclib.def'
         it.headers "$projectDir/interop/objc/kt42172/objclib.h"
     }
+    createInterop("objc_kt48816") {
+        it.defFile 'interop/objc/kt48816/objclib.def'
+        it.headers "$projectDir/interop/objc/kt48816/objclib.h"
+    }
 }
 
 createInterop("withSpaces") {
@@ -4952,6 +4956,20 @@ if (PlatformInfo.isAppleTarget(project)) {
         }
     }
 
+    interopTest("interop_objc_kt48816_without_lazy_ir_for_caches") {
+        // Without a fix, fails in two-stage mode.
+        source = "interop/objc/kt48816/main.kt"
+        interop = "objc_kt48816"
+        // The bug was accidentally fixed with lazy IR for caches, so testing it with this feature disabled:
+        flags = ["-Xlazy-ir-for-caches=disable"]
+    }
+
+    interopTest("interop_objc_kt48816_with_lazy_ir_for_caches") {
+        source = "interop/objc/kt48816/main.kt"
+        interop = "objc_kt48816"
+        flags = ["-Xlazy-ir-for-caches=enable"]
+    }
+
     standaloneTest("objc_arc_contract") {
         doBeforeBuild {
             mkdir(buildDir)