Allow undefined symbols in shared library by default.

It's not our business to resolve those undefined symbols.
We just trust the linker will load the library and its dependencies
correctly, which is actually what happens, modulo bugs in the dynamic
linker itself.

PR:		23035
Differential Revision:	http://reviews.llvm.org/D8886

llvm-svn: 234378

lld/lib/Core/LinkingContext.cpp

@@ -24,7 +24,7 @@ LinkingContext::LinkingContext()
       _warnIfCoalesableAtomsHaveDifferentCanBeNull(false),
       _warnIfCoalesableAtomsHaveDifferentLoadName(false),
       _printRemainingUndefines(true), _allowRemainingUndefines(false),
-      _logInputFiles(false), _allowShlibUndefines(false),
+      _logInputFiles(false), _allowShlibUndefines(true),
       _outputFileType(OutputFileType::Default), _nextOrdinal(0) {}
 
 LinkingContext::~LinkingContext() {}