natClass.cc (_Jv_IsAssignableFrom): Ensure that ancestors table index is within allow...

natClass.cc (_Jv_IsAssignableFrom): Ensure that ancestors table index is within allowed bounds.

2001-06-05  Martin Kahlert  <martin.kahlert@infineon.com>
	    Bryce McKinlay  <bryce@waitaki.otago.ac.nz>

	* java/lang/natClass.cc (_Jv_IsAssignableFrom): Ensure that ancestors
	table index is within allowed bounds. Ensure that we dont try to access
	class itable at a negative offset. Avoid an ancestor table lookup if
	source is a primitive type class.
	(isInstance): Remove redundant isPrimitive() check.

Co-Authored-By: Bryce McKinlay <bryce@waitaki.otago.ac.nz>
From-SVN: r42898