[mips] Do not pass redundant IsN64 flag to MCELFObjectTargetWriter. NFC

Now we pass the 'Is64_' flag to the MCELFObjectTargetWriter ctor iif
when we make deal with N64 ABI. So it is redundant to pass additional
'IsN64' flag.

llvm-svn: 313878
diff --git a/llvm/lib/MC/MCELFObjectTargetWriter.cpp b/llvm/lib/MC/MCELFObjectTargetWriter.cpp
index 68fb5e7..483ee94 100644
--- a/llvm/lib/MC/MCELFObjectTargetWriter.cpp
+++ b/llvm/lib/MC/MCELFObjectTargetWriter.cpp
@@ -11,15 +11,11 @@
 
 using namespace llvm;
 
-MCELFObjectTargetWriter::MCELFObjectTargetWriter(bool Is64Bit_,
-                                                 uint8_t OSABI_,
+MCELFObjectTargetWriter::MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_,
                                                  uint16_t EMachine_,
-                                                 bool HasRelocationAddend_,
-                                                 bool IsN64_)
-  : OSABI(OSABI_), EMachine(EMachine_),
-    HasRelocationAddend(HasRelocationAddend_), Is64Bit(Is64Bit_),
-    IsN64(IsN64_){
-}
+                                                 bool HasRelocationAddend_)
+    : OSABI(OSABI_), EMachine(EMachine_),
+      HasRelocationAddend(HasRelocationAddend_), Is64Bit(Is64Bit_) {}
 
 bool MCELFObjectTargetWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
                                                       unsigned Type) const {