RFR: 8197842: Remove unused macros VM_STRUCTS_EXT and VM_TYPES_EXT

[Lois Foltan]

Looks good.
Lois

On 2/28/2018 10:49 AM, Erik Helin wrote:
> Hi all,
>
> this patch removes the unused extension marcos VM_STRUCTS_EXT and 
> VM_TYPES_EXT. Since these macros are the only content of 
> vmStructs_ext.hpp, this patch also removes the file vmStructs_ext.hpp.
>
> Issue:
> https://bugs.openjdk.java.net/browse/JDK-8197842
>
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8197842/00/
>
> Testing:
> - `make run-test-tier1` on Linux x86-64
>
> Thanks,
> Erik