[MC] Remove MCAssembler's copy of OS

We can just ask the ObjectWriter for it's stream instead of caching
around our own reference to it.  No functionality change is intended.

llvm-svn: 246604

llvm/include/llvm/MC/MCAssembler.h

@@ -576,8 +576,6 @@ private:
 
   MCObjectWriter &Writer;
 
-  raw_ostream &OS;
-
   SectionListType Sections;
 
   SymbolDataListType Symbols;
@@ -723,8 +721,7 @@ public:
   // option is to make this abstract, and have targets provide concrete
   // implementations as we do with AsmParser.
   MCAssembler(MCContext &Context_, MCAsmBackend &Backend_,
-              MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
-              raw_ostream &OS);
+              MCCodeEmitter &Emitter_, MCObjectWriter &Writer_);
   ~MCAssembler();
 
   /// Reuse an assembler instance

llvm/lib/MC/MCAssembler.cpp

@@ -325,11 +325,10 @@ void MCFragment::destroy() {
 /* *** */
 
 MCAssembler::MCAssembler(MCContext &Context_, MCAsmBackend &Backend_,
-                         MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
-                         raw_ostream &OS_)
+                         MCCodeEmitter &Emitter_, MCObjectWriter &Writer_)
     : Context(Context_), Backend(Backend_), Emitter(Emitter_), Writer(Writer_),
-      OS(OS_), BundleAlignSize(0), RelaxAll(false),
-      SubsectionsViaSymbols(false), ELFHeaderEFlags(0) {
+      BundleAlignSize(0), RelaxAll(false), SubsectionsViaSymbols(false),
+      ELFHeaderEFlags(0) {
   VersionMinInfo.Major = 0; // Major version == 0 for "none specified"
 }
 
@@ -933,6 +932,7 @@ void MCAssembler::Finish() {
   MCAsmLayout Layout(*this);
   layout(Layout);
 
+  raw_ostream &OS = getWriter().getStream();
   uint64_t StartOffset = OS.tell();
 
   // Write the object file.

llvm/lib/MC/MCObjectStreamer.cpp

@@ -28,7 +28,7 @@ MCObjectStreamer::MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
                                    MCCodeEmitter *Emitter_)
     : MCStreamer(Context),
       Assembler(new MCAssembler(Context, TAB, *Emitter_,
-                                *TAB.createObjectWriter(OS), OS)),
+                                *TAB.createObjectWriter(OS))),
       EmitEHFrame(true), EmitDebugFrame(false) {}
 
 MCObjectStreamer::~MCObjectStreamer() {