[inliner] parent fix after copy

this change fix issue with inlining lambda in inline function which(function) inlined from other library.
E.g.

> cat i-lib.kt
class _special_class(val v:Int)
class _special_class1(val v:Int)

class __helper(val v:Int)

inline fun foo(h: __helper): Int {
    val sum = h.op {
        _special_class(it.v)
    }.v
    return sum
}

inline fun __helper.op(block:(_special_class1) -> _special_class) = block(_special_class1(v))

> cat i-main.kt
fun main() {
    val h = __helper(42)
    println(foo(h))
}

Here how the incorrect parent affects debug information:

(lldb) target create "program.kexe"
Current executable set to '/Users/minamoto/ws/kotlin-native/program.kexe' (x86_64).
(lldb) command source -s 0 'i-test.lldb'
Executing commands in '/Users/minamoto/ws/kotlin-native/i-test.lldb'.
(lldb) b i-lib.kt:8
Breakpoint 1: where = program.kexe`kfun:#main(){} + 435 [inlined] foo + 98 at i-main.kt:3, address = 0x00000001000540e3
(lldb) r
Process 70550 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x00000001000540e3 program.kexe`kfun:#main(){} [inlined] foo at i-lib.kt:9:7
   6       inline fun foo(h: __helper): Int {
   7           val sum = h.op {
   8               _special_class(it.v)
-> 9           }.v
              ^
   10          return sum
   11      }
   12
Target 0: (program.kexe) stopped.

the parent of lambda is i-main.kt instead of i-lib.kt, and offsets calculated against wrong file.
Here is behaviour with fix:

(lldb) target create "program.kexe"
Current executable set to '/Users/minamoto/ws/.git-trees/minamoto/debug-info/subprograms-with-missed-scopes/program.kexe' (x86_64).
(lldb) command source -s 0 '/Users/minamoto/ws/kotlin-native/i-test.lldb'
Executing commands in '/Users/minamoto/ws/kotlin-native/i-test.lldb'.
(lldb) b i-lib.kt:8
Breakpoint 1: where = program.kexe`kfun:#main(){} + 337 [inlined] <anonymous>_2 at i-lib.kt:14, address = 0x0000000100054bb1
(lldb) r
Process 70560 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x0000000100054bb1 program.kexe`kfun:#main(){} [inlined] <anonymous>_2 at i-lib.kt:8:24
   5
   6       inline fun foo(h: __helper): Int {
   7           val sum = h.op {
-> 8               _special_class(it.v)
                               ^
   9           }.v
   10          return sum
   11      }
Target 0: (program.kexe) stopped.

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/inline/DeepCopyIrTreeWithDescriptors.kt

@@ -9,6 +9,7 @@ import org.jetbrains.kotlin.backend.common.CommonBackendContext
 import org.jetbrains.kotlin.backend.common.DescriptorsToIrRemapper
 import org.jetbrains.kotlin.backend.common.WrappedDescriptorPatcher
 import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.declarations.IrDeclaration
 import org.jetbrains.kotlin.ir.declarations.IrDeclarationParent
 import org.jetbrains.kotlin.ir.declarations.IrTypeParametersContainer
 import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
@@ -40,6 +41,10 @@ internal class DeepCopyIrTreeWithSymbolsForInliner(
         result.acceptVoid(WrappedDescriptorPatcher)
 
         result.patchDeclarationParents(parent)
+        if (irElement is IrDeclaration) {
+            (result as? IrDeclaration)?.parent = irElement.parent
+        }
+
         return result
     }