[SR-10776] Calling XMLDocument's `var name: String?` induces runtime crash on Linux.

[YOCKOW]

Previous ID	SR-10776
Radar	None
Original Reporter	@YOCKOW
Type	Bug
Status	Resolved
Resolution	Done

Environment

Swift 5.0.1
Ubuntu 18.04

Additional Detail from JIRA

Votes	0
Component/s	Foundation
Labels	Bug, RunTimeCrash
Assignee	@YOCKOW
Priority	Medium

md5: 2dbda6a18247e0609926b22b99df2e8a

Issue Description:

The code below can be compiled, but runtime crash occurs with segfault on Linux.

import Foundation

let doc = XMLDocument(rootElement: nil)
print(doc.name)

[Result on REPL]

Process 3697 stopped
* thread #​1, name = 'repl_swift', stop reason = signal SIGSEGV: invalid address (fault address: 0x100000017)
    frame #​0: 0x00007ffff3e15a2b libFoundation.so`_CFXMLNodeCopyName + 43
libFoundation.so`_CFXMLNodeCopyName:
->  0x7ffff3e15a2b <+43>: movq   0x18(%rax), %rsi
    0x7ffff3e15a2f <+47>: jmp    0x7ffff3e15a33            ; <+51>
    0x7ffff3e15a31 <+49>: xorl   %esi, %esi
    0x7ffff3e15a33 <+51>: xorl   %r14d, %r14d
Target 0: (repl_swift) stopped.
doc: Foundation.XMLDocument = <extracting data from value failed>

[YOCKOW]

PR#2316

[YOCKOW]

#2316 has been merged into master: 482a27a