6795913: A few remaining wrong casts need to be fixed for building hotspot successfully on Mac OS.
Summary: Use NULL_WORD in the places where intptr_t is expected due to incompatible types between intptr_t & int32_t
Reviewed-by: phh, coleenp, never
6792705: Add JAR file to bootclasspath when using AggressiveOpts
Summary: During argument processing, add alt-rt.jar to the bootclasspath between bootclasspath/p and default elements.
Reviewed-by: xlu, coleenp