JDWP: more checking for StackFrame commands

Checks thread is suspended and the slot is valid for GetValues and
SetValues command. Also improves error messages when we could not
get or set a local value in the stack or we try to read an invalid
reference from the stack.

Bug: 15680615
Change-Id: I629099fc908e733edb712bd43e141695ed858f4f
1 file changed