Creating a matrix as Symmetric causes excessive allocations in multithreaded loop

[mcabbott]

@pedrohnv

    rbar = rand(Float64, (ne,ne)) * 30
    rbar = Symmetric(rbar, :L)  # comment this line to see the difference

Here @code_warntype foo() shows a problem. The issue is that you’re using the same name for two objects of differing type, which sometimes the compiler is smart enough to understand, but not always. If you give the first one a different name, the problem goes away.