RFR: 8255523: Clean up temporary shared_locs initializations

[David Holmes]

On Wed, 28 Oct 2020 09:36:55 GMT, Aleksey Shipilev <shade 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?

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Marked as reviewed by dholmes (Reviewer).

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