Make stdlib work with -Xmultifile-package-facades.

Fixed wrong owner mapping in presence of -Xmultifile-package-facades.
Fixed backing field mapping issue.
Added more tests.

compiler/testData/codegen/boxMultiFile/inlineMultifileClassMemberFromOtherPackage/box.kt

@@ -0,0 +1,5 @@
+package test
+
+import a.foo
+
+fun box(): String = foo { "OK" }

compiler/testData/codegen/boxMultiFile/inlineMultifileClassMemberFromOtherPackage/foo.kt

@@ -0,0 +1,4 @@
+@file:[JvmName("APackage") JvmMultifileClass]
+package a
+
+inline fun foo(body: () -> String): String = zee(body())

compiler/testData/codegen/boxMultiFile/inlineMultifileClassMemberFromOtherPackage/zee.kt

@@ -0,0 +1,4 @@
+@file:[JvmName("APackage") JvmMultifileClass]
+package a
+
+public fun zee(x: String): String = x

compiler/testData/codegen/boxMultiFile/multifileClassPartsInitialization/box.kt

@@ -0,0 +1,3 @@
+import a.*
+
+fun box(): String = OK

compiler/testData/codegen/boxMultiFile/multifileClassPartsInitialization/part1.kt

@@ -0,0 +1,4 @@
+@file:[JvmName("MultifileClass") JvmMultifileClass]
+package a
+
+val O: String = "O"

compiler/testData/codegen/boxMultiFile/multifileClassPartsInitialization/part2.kt

@@ -0,0 +1,4 @@
+@file:[JvmName("MultifileClass") JvmMultifileClass]
+package a
+
+val K: String = "K"

compiler/testData/codegen/boxMultiFile/multifileClassPartsInitialization/part3.kt

@@ -0,0 +1,4 @@
+@file:[JvmName("MultifileClass") JvmMultifileClass]
+package a
+
+val OK: String = O + K