Make sure to default ${prefix} to /usr/local if the user didn't specify it.
This assists with getting around configure's late binding values so that
our LLVM variables don't end up with a "NONE" prefix.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28325 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/configure b/configure
index b235fcd..9b0e36e 100755
--- a/configure
+++ b/configure
@@ -30739,6 +30739,9 @@
 # Translate the various configuration directories and other basic
 # information into substitutions that will end up in Makefile.config.in
 # that these configured values can be used by the makefiles
+if test "${prefix}" == "NONE" ; then
+  prefix="/usr/local"
+fi
 eval LLVM_PREFIX="${prefix}";
 eval LLVM_BINDIR="${prefix}/bin";
 eval LLVM_LIBDIR="${prefix}/lib";