/usr/lib/llvm-3.1/build/autoconf/m4/config_makefile.m4 is in llvm-3.1-dev 3.1-2ubuntu1~12.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #
# Configure a Makefile without clobbering it if it exists and is not out of
# date. This macro is unique to LLVM.
#
AC_DEFUN([AC_CONFIG_MAKEFILE],
[AC_CONFIG_COMMANDS($1,
[${llvm_src}/autoconf/mkinstalldirs `dirname $1`
${SHELL} ${llvm_src}/autoconf/install-sh -m 0644 -c ${srcdir}/$1 $1])
])
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