Support 'call' for primary value of an inline class

Getter of a primary value of an inline class belongs to the box class.
Its arguments should not be unboxed when the method is called.
However, its result might require boxing if it's an inline class value.

When we have an internal primary value, there's no getter method.
In fact, we can use box/unbox methods for inline class directly
(don't forget to box the result, it may be an inline class type value).

 #KT-26748

compiler/backend/src/org/jetbrains/kotlin/codegen/PropertyReferenceCodegen.kt

@@ -256,7 +256,7 @@ class PropertyReferenceCodegen(
             }
             val declaration = DescriptorUtils.unwrapFakeOverride(accessor).original
             val method =
-                if (callable.containingDeclaration.isInlineClass())
+                if (callable.containingDeclaration.isInlineClass() && !declaration.isGetterOfUnderlyingPropertyOfInlineClass())
                     state.typeMapper.mapSignatureForInlineErasedClassSkipGeneric(declaration).asmMethod
                 else
                     state.typeMapper.mapAsmMethod(declaration)

compiler/backend/src/org/jetbrains/kotlin/codegen/context/CodegenContextUtil.kt

@@ -17,9 +17,11 @@
 package org.jetbrains.kotlin.codegen.context
 
 import org.jetbrains.kotlin.codegen.OwnerKind
+import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.resolve.isGetterOfUnderlyingPropertyOfInlineClass
 import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.org.objectweb.asm.Type
 
@@ -34,13 +36,19 @@ object CodegenContextUtil {
 
     @JvmStatic
     fun isImplementationOwner(owner: CodegenContext<*>, descriptor: DeclarationDescriptor): Boolean {
-        if (descriptor.containingDeclaration?.isInlineClass() == true) {
+        if (descriptor is CallableDescriptor && descriptor.containingDeclaration.isInlineClass()) {
             val isInErasedMethod = owner.contextKind == OwnerKind.ERASED_INLINE_CLASS
+
+            if (descriptor.isGetterOfUnderlyingPropertyOfInlineClass()) {
+                return !isInErasedMethod
+            }
+
             when (descriptor) {
                 is FunctionDescriptor -> return isInErasedMethod
                 is PropertyDescriptor -> return !isInErasedMethod
             }
         }
+
         return owner !is MultifileClassFacadeContext
     }
 }