Merge pull request #6616 from aviks/as/javaperf

update perf since randmtzig.c is no longer in julia src
Fix a type inference issue

For FooBar{s}.parameters[1] where s is a symbol, type inference deduced the
type to be Type{:x}. Unfortunately, this doesn't actually work because Type{:x}
may be widened to Type at any time at which point it becomes incorrect.
Enable running java perf via Makefile