[RTEMS Project] #4510: Add -DPREFER_SIZE_OVER_SPEED for AArch64 builds

[RTEMS trac]

#4510: Add -DPREFER_SIZE_OVER_SPEED for AArch64 builds
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  Reporter:  Ryan Long     |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  normal        |  Milestone:  6.1
 Component:  arch/aarch64  |    Version:  6
  Severity:  normal        |   Keywords:
Blocked By:                |   Blocking:
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 This flag is needed to force the generation of AArch64 assembly from C
 sources instead of using the hand-optimized code in newlib. The existing
 hand-optimized code does not support ILP32.

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Ticket URL: <http://devel.rtems.org/ticket/4510>
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