rename ENABLE_THREADS to LLVM_ENABLE_THREADS

Now that it needs to be exported in a public header (Valgrind.h)
it should be prefixed to avoid collision with other projects.
Add it to llvm-config.h as well.

This'll require regenerating the configure script after this
commit, but I don't have the required autoconf version.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145214 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index d777553..5503e3a 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -538,12 +538,13 @@
                              [Use threads if available (default is YES)]),,
                              enableval=default)
 case "$enableval" in
-  yes) AC_SUBST(ENABLE_THREADS,[1]) ;;
-  no)  AC_SUBST(ENABLE_THREADS,[0]) ;;
-  default) AC_SUBST(ENABLE_THREADS,[1]) ;;
+  yes) AC_SUBST(LLVM_ENABLE_THREADS,[1]) ;;
+  no)  AC_SUBST(LLVM_ENABLE_THREADS,[0]) ;;
+  default) AC_SUBST(LLVM_ENABLE_THREADS,[1]) ;;
   *) AC_MSG_ERROR([Invalid setting for --enable-threads. Use "yes" or "no"]) ;;
 esac
-AC_DEFINE_UNQUOTED([ENABLE_THREADS],$ENABLE_THREADS,[Define if threads enabled])
+AC_DEFINE_UNQUOTED([LLVM_ENABLE_THREADS],$LLVM_ENABLE_THREADS,
+                   [Define if threads enabled])
 
 dnl Allow disablement of pthread.h
 AC_ARG_ENABLE(pthreads,
@@ -1144,7 +1145,7 @@
 
 dnl pthread locking functions are optional - but llvm will not be thread-safe
 dnl without locks.
-if test "$ENABLE_THREADS" -eq 1 && test "$ENABLE_PTHREADS" -eq 1 ; then
+if test "$LLVM_ENABLE_THREADS" -eq 1 && test "$ENABLE_PTHREADS" -eq 1 ; then
   AC_CHECK_LIB(pthread, pthread_mutex_init)
   AC_SEARCH_LIBS(pthread_mutex_lock,pthread,
                  AC_DEFINE([HAVE_PTHREAD_MUTEX_LOCK],[1],
@@ -1235,7 +1236,7 @@
 AC_CHECK_HEADERS([sys/types.h sys/ioctl.h malloc/malloc.h mach/mach.h])
 AC_CHECK_HEADERS([valgrind/valgrind.h])
 AC_CHECK_HEADERS([fenv.h])
-if test "$ENABLE_THREADS" -eq 1 && test "$ENABLE_PTHREADS" -eq 1 ; then
+if test "$LLVM_ENABLE_THREADS" -eq 1 && test "$ENABLE_PTHREADS" -eq 1 ; then
   AC_CHECK_HEADERS(pthread.h,
                    AC_SUBST(HAVE_PTHREAD, 1),
                    AC_SUBST(HAVE_PTHREAD, 0))