Add HandleMark in Deoptimization::uncommon_trap before Deoptimization::fetch_unroll_info_helper, avoid reference hold in HandleArea increase object lifetime. This makes object lifetime consistent with/without uncommon trap.

In following test, WeakReference is expected cleared after GC, but it fails with option "-XX:-Inline -XX:-TieredCompilation -XX:CompileCommand=compileonly,UncommonTrapLeak.foo -XX:CompileThreshold=100 -XX:-BackgroundCompilation". Reference's referent object is still alive after "foo" finish, because with uncommon trap, oops are recorded in HandleArea and HandleArea is not poped after uncommon trap process.

public class UncommonTrapLeak {
    static WeakReference<Object> ref = null;
    static int val = 0;
    public static void main(String args[]) {
        for (int i = 0; i < 300; i++) {
            val++;
            foo(i);
            System.gc();
            if (ref.get() != null) {
                throw new RuntimeException("Failed: referent not collected after trap " + ref.get());
            }
            if (i % 100 == 0) {
                System.out.println(i);
            }
        }
    }

    static void foo(int i) {
        Object o = new Object();
        ref = new WeakReference<Object>(o);
        if (val == 200) {
            // trigger Deoptimization::uncommon_trap
            if (o instanceof UncommonTrapLeak) {
            }
        }
    }
}

When Deoptimization::fetch_unroll_info_helper return, all oops in deoptimized frames are saved in Deoptimization::UnrollBlock or Thread data structure, HandleArea can be restored safely.

1. local and expression oops raw address is stored in vframeArrayElement _locals/_expressions as intptr
2. return value restore, raw oop recoreded in frame // (oop *)map->location(rax->as_VMReg());
3. exception object, raw oop recorded on Thread._exception_oop

In deoptimize blob, JRT_BLOCK_ENTRY(Deoptimization::fetch_unroll_info) has HandleMarkCleaner, HandleArea is restored after Deoptimization::fetch_unroll_info_helper finish. So it's also safe to add HandleMark in Deoptimization::uncommon_trap before fetch_unroll_info_helper.
Proposed fix is adding HandleMark in Deoptimization::uncommon_trap before Deoptimization::fetch_unroll_info_helper.