Add a front-end test case for r176036.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@176038 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer] Handle reference parameters with default values.

r175026 added support for default values, but didn't take reference
parameters into account, which expect the default argument to be an
lvalue. Use createTemporaryRegionIfNeeded if we can evaluate the default
expr as an rvalue but the expected result is an lvalue.

Fixes the most recent report of PR12915. The original report predates
default argument support, so that can't be it.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@176042 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer] Address Jordan's code review of r175857.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@176043 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Add more attributes from the command line to functions."

This reverts commit 176009.

The commit is a likely cause of several buildbot failures.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@176044 91177308-0d34-0410-b5e6-96231b3b80d8