build: Add LLVM_NATIVE_ARCHNAME, which has the sensible value, without "Target"
appended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110109 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 0924a77..18c9669 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -599,6 +599,8 @@
 for a_target in $TARGETS_TO_BUILD; do
   if test "$a_target" = "$LLVM_NATIVE_ARCH"; then
     LLVM_NATIVE_ARCHTARGET="${LLVM_NATIVE_ARCH}Target"
+    AC_DEFINE_UNQUOTED(LLVM_NATIVE_ARCHNAME,$LLVM_NATIVE_ARCH,
+      [Short LLVM architecture name for the native architecture, if available])
     AC_DEFINE_UNQUOTED(LLVM_NATIVE_ARCH,$LLVM_NATIVE_ARCHTARGET,
       [LLVM architecture name for the native architecture, if available])
   fi