RFR 8145628: hotspot metadata classes shouldn't use HeapWordSize or heap related macros like align_object_size

[Coleen Phillimore]

Summary: Use align_metadata_size, align_metadata_offset and 
is_metadata_aligned for metadata rather
than align_object_size, etc.  Use wordSize rather than HeapWordSize for 
metadata.  Use align_ptr_up
rather than align_pointer_up (all the related functions are ptr).

Ran RBT quick tests on all platforms along with Chris's Plummers change 
for 8143608, ran jtreg hotspot tests and nsk.sajdi.testlist co-located 
tests because there are SA changes.   Reran subset of this after merging.

I have a script to update copyrights on commit. It's not a big change, 
just mostly boring.  See the bug comments for more details about the change.

open webrev at http://cr.openjdk.java.net/~coleenp/8145628.01/
bug link https://bugs.openjdk.java.net/browse/JDK-8145628

thanks,
Coleen