Revert "[mips] N64 static relocation model support"

This reverts commit r293164. There are multiple tests failing.

llvm-svn: 293170
diff --git a/llvm/lib/Target/Mips/MipsAsmPrinter.cpp b/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
index 04c5d96..04d6529 100644
--- a/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
+++ b/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
@@ -574,8 +574,6 @@
   case MipsII::MO_GOT:      O << "%got(";    break;
   case MipsII::MO_ABS_HI:   O << "%hi(";     break;
   case MipsII::MO_ABS_LO:   O << "%lo(";     break;
-  case MipsII::MO_HIGHER:   O << "%higher("; break;
-  case MipsII::MO_HIGHEST:  O << "%highest(("; break;
   case MipsII::MO_TLSGD:    O << "%tlsgd(";  break;
   case MipsII::MO_GOTTPREL: O << "%gottprel("; break;
   case MipsII::MO_TPREL_HI: O << "%tprel_hi("; break;
@@ -700,7 +698,7 @@
     //        Ideally it should test for properties of the ABI and not the ABI
     //        itself.
     //        For the moment, I'm only correcting enough to make MIPS-IV work.
-    if (!isPositionIndependent() && STI.hasSym32())
+    if (!isPositionIndependent() && !ABI.IsN64())
       TS.emitDirectiveOptionPic0();
   }