Use raw_pwrite_stream in the object writer/streamer.

The ELF object writer will take advantage of that in the next commit.

llvm-svn: 234950
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
index acf6f21..dbcd867 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
@@ -155,7 +155,8 @@
   return Value;
 }
 
-MCObjectWriter *MipsAsmBackend::createObjectWriter(raw_ostream &OS) const {
+MCObjectWriter *
+MipsAsmBackend::createObjectWriter(raw_pwrite_stream &OS) const {
   return createMipsELFObjectWriter(OS,
     MCELFObjectTargetWriter::getOSABI(OSType), IsLittle, Is64Bit);
 }