6732698: crash with dead code from compressed oops in gcm Reviewed-by: rasbold

6611837: block frequency is zero Summary: insert_goto_at should set frequency for newly created blocks Reviewed-by: never

6732732: CTW with EA: assert(n != 0L,"Bad immediate dominator info.") Summary: Missing edge to a call's return value in EA Connection Graph. Reviewed-by: never

6741738: TypePtr::add_offset() set incorrect offset when the add overflows Summary: Set offset to OffsetBot when the add overflows in TypePtr::add_offset() Reviewed-by: jrose, never