[SystemZ] Add configure bits

This patch wires up the SystemZ target in configure, so that it can now be
built using --enable-targets=systemz.   It is not yet included in the default
build (--enable-targets=all); this will be done by a follow-up patch.

Patch by Richard Sandiford.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181208 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index d03b3f6..7f8c48d 100755
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -378,6 +378,8 @@
   set(LLVM_NATIVE_ARCH MSP430)
 elseif (LLVM_NATIVE_ARCH MATCHES "hexagon")
   set(LLVM_NATIVE_ARCH Hexagon)
+elseif (LLVM_NATIVE_ARCH MATCHES "s390x")
+  set(LLVM_NATIVE_ARCH SystemZ)
 else ()
   message(FATAL_ERROR "Unknown architecture ${LLVM_NATIVE_ARCH}")
 endif ()