7198529: NPG: assert with NMT code in Thread destructor
Summary: Thread stack's base address can be NULL if it is not started or exited before recording the base
Reviewed-by: kvn, fparain
roland [Thu, 13 Sep 2012 22:09:16 +0200] rev 13747
7198074: NPG: assert(((Metadata*)obj)->is_valid()) failed: obj is valid
Summary: missing test for T_METADATA leads to incorrect register allocation.
Reviewed-by: kvn