RFR: 8255523: Clean up temporary shared_locs initializations

[Aleksey Shipilev]

On Mon, 16 Nov 2020 10:11:26 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> See #648. Apparently, LLVM 11 complains that we are computing the number of elements over the array of a different type. Instead of ignoring the warning, it seems better to just clean up that code. We can allocate the whole thing as resource array of the same size. `sizeOf(relocInfo) = 2`, since it carries `unsigned short`.
>
> Seems quite reasonable. We already have other resource area usage in that code. 
> 
> Not clear why the stack buffer was incorrectly typed in the first place? Alignment issue perhaps?

Ew. Actually now I discovered https://bugs.openjdk.java.net/browse/JDK-8253375 and https://bugs.openjdk.java.net/browse/JDK-8253868. This needs more work.

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PR: https://git.openjdk.java.net/jdk/pull/897