Remove alloca config.h support.
 - I did not actually remove the configure test itself, someone who can
   regenerate configure should do this (see FIXME in autoconf/configure.ac)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79881 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index f5731e9..22e4076 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -1092,6 +1092,7 @@
 AC_CHECK_FUNCS([strtoll strtoq sysconf malloc_zone_statistics ])
 AC_CHECK_FUNCS([setjmp longjmp sigsetjmp siglongjmp])
 AC_C_PRINTF_A
+dnl FIXME: This is no longer used, please remove (but test)!!!
 AC_FUNC_ALLOCA
 AC_FUNC_RAND48