Serialize and deserialize 'header' modifier for descriptors

This fixes KT-17001 because now 'header' modifier is loaded correctly
for deserialized members and the standard disambiguation in
OverloadingConflictResolver.compareCallsByUsedArguments takes place,
where header members are discriminated against the corresponding impl
members

 #KT-17001 Fixed

compiler/testData/multiplatform/regressions/kt17001/common.kt

@@ -0,0 +1,7 @@
+package test
+
+header fun stringToByteArray(str: String): ByteArray
+
+header var prop: String
+
+fun ttt() {}

compiler/testData/multiplatform/regressions/kt17001/jvm.kt

@@ -0,0 +1,5 @@
+package test
+
+impl fun stringToByteArray(str: String): ByteArray = byteArrayOf()
+
+impl var prop: String = ""

compiler/testData/multiplatform/regressions/kt17001/jvm2.kt

@@ -0,0 +1,7 @@
+package test
+
+fun bar() {
+    stringToByteArray("foo bar baz")
+    prop
+    prop = ""
+}

compiler/testData/multiplatform/regressions/kt17001/output.txt

@@ -0,0 +1,11 @@
+-- Common --
+Exit code: OK
+Output:
+
+-- JVM --
+Exit code: OK
+Output:
+
+-- JVM (2) --
+Exit code: OK
+Output: