[PATCH][AAarch64] Add support for TARGET_COMPUTE_FRAME_LAYOUT

[Vlad Lazar]

Hi all,

The patch adds support for the TARGET_COMPUTE_FRAME_LAYOUT hook on AArch64
and removes unneeded frame layout recalculation.

Bootstrapped and regtested on aarch64-none-linux-gnu and there are no 
regressions.

Thanks,
Vlad

gcc/
2018-07-02  Vlad Lazar  <vlad.la...@arm.com>

        * config/aarch64/aarch64.h (TARGET_COMPUTE_FRAME_LAYOUT): Define.
        * config/aarch64/aarch64.c (aarch64_expand_prologue, 
aarch64_expand_epilogue,
        aarch64_initial_elimination_offset): Remove aarch64_layout_frame calls.

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