Move getSymbol to TargetLoweringObjectFile.

This allows constructing a Mangler with just a TargetMachine.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193630 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/LTO/LTOModule.cpp b/lib/LTO/LTOModule.cpp
index 98c5416..db9b9c9 100644
--- a/lib/LTO/LTOModule.cpp
+++ b/lib/LTO/LTOModule.cpp
@@ -43,7 +43,7 @@
 LTOModule::LTOModule(llvm::Module *m, llvm::TargetMachine *t)
   : _module(m), _target(t),
     _context(_target->getMCAsmInfo(), _target->getRegisterInfo(), NULL),
-    _mangler(_context, t) {}
+    _mangler(t) {}
 
 /// isBitcodeFile - Returns 'true' if the file (or memory contents) is LLVM
 /// bitcode.