[libunwind][MIPS]: Rename Registers_mips_n64 to Registers_mips_newabi.

This is in preparation for adding support for N32 unwinding which reuses
the newabi register class.

Reviewed By: compnerd

Differential Revision: https://reviews.llvm.org/D41842

llvm-svn: 322093
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 40bab3755112a37df15c4fbc8b9664366cd86ec0
diff --git a/src/libunwind.cpp b/src/libunwind.cpp
index de57569..4079de3 100644
--- a/src/libunwind.cpp
+++ b/src/libunwind.cpp
@@ -64,7 +64,7 @@
 #elif defined(__mips__) && defined(_ABIO32) && defined(__mips_soft_float)
 # define REGISTER_KIND Registers_mips_o32
 #elif defined(__mips__) && defined(_ABI64) && defined(__mips_soft_float)
-# define REGISTER_KIND Registers_mips_n64
+# define REGISTER_KIND Registers_mips_newabi
 #elif defined(__mips__)
 # warning The MIPS architecture is not supported with this ABI and environment!
 #else