Revert [mips] Adds support for R_MIPS_26, HIGHER, HIGHEST relocations in RuntimeDyld

Reverting due to build bot failures

llvm-svn: 306000
diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
index f37bd0b..fb5da6d 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
@@ -66,10 +66,8 @@
       return 20; // movz; movk; movk; movk; br
     if (Arch == Triple::arm || Arch == Triple::thumb)
       return 8; // 32-bit instruction and 32-bit address
-    else if (IsMipsO32ABI || IsMipsN32ABI)
+    else if (IsMipsO32ABI)
       return 16;
-    else if (IsMipsN64ABI)
-      return 32;
     else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le)
       return 44;
     else if (Arch == Triple::x86_64)