Fix configure to find arc4random via header files.

ISSUE:

On Ubuntu 12.04 LTS, arc4random is provided by libbsd.so, which is a
transitive dependency of libedit. If a system had libedit on it that
was implemented in terms of libbsd.so, then the arc4random test,
previously implemented as a linker test, would succeed with -ledit.
However, on Ubuntu this would also require a #include <bsd/stdlib.h>.
This caused a build breakage on configure-based Ubuntu 12.04 with
libedit installed.

FIX:

This fix changes configure to test for arc4random by searching for it
in the standard header files. On Ubuntu 12.04, this test now properly
fails to find arc4random as it is not defined in the default header
locations. It also tweaks the #define names to match the output of the
header check command, which is slightly different than the linker
function check #defines.

I tested the following scenarios:

(1) Ubuntu 12.04 without the libedit package [did not find arc4random,
as expected]

(2) Ubuntu 12.04 with libedit package [properly did not find
arc4random, as expected]

(3) Ubuntu 12.04 with most recent libedit, custom built, and not
dependent on libbsd.so [properly did not find arc4random, as
expected].

(4) FreeBSD 10.0B1 [properly found arc4random, as expected]


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200819 91177308-0d34-0410-b5e6-96231b3b80d8
Use the information provided by getFlags to unify some code in llvm-nm.

It is not clear how much we should try to expose in getFlags. For example,
should there be a SF_Object and a SF_Text?

But for information that is already being exposed, we may as well use it in
llvm-nm.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200820 91177308-0d34-0410-b5e6-96231b3b80d8
Add CheckChildInteger to ISelMatcher operations. Removes nearly 2000 bytes from X86 matcher table.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200821 91177308-0d34-0410-b5e6-96231b3b80d8