[ARM64] Ensure arm64_be is dealt with when emitting debug info.

This is a partial port of r204816 (cpirker "Elf support for MC-JIT
runtime dynamic linker") from AArch64 to ARM64.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207625 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MCObjectFileInfo.cpp

@@ -291,7 +291,8 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
     }
   } else if (T.getArch() == Triple::aarch64 ||
              T.getArch() == Triple::aarch64_be ||
-             T.getArch() == Triple::arm64) {
+             T.getArch() == Triple::arm64 ||
+             T.getArch() == Triple::arm64_be) {
     // The small model guarantees static code/data size < 4GB, but not where it
     // will be in memory. Most of these could end up >2GB away so even a signed
     // pc-relative 32-bit address is insufficient, theoretically.