[ARM] Add unwind portable header adaptor.

ARM expanse some functions to others. For example,
_Unwind_GetIP will be inlined to _Unwind_GetGR, which
will be inlined to _Unwind_VRS_Get. This happens at
header-included level.

However, we use Itanium _Unwind_* header as portable one.
We do the inlining in ARM libportable to prevent
undefined reference to these functions.

Change-Id: Iad94c4a92531cdcfbcf535443fb257d02cb24c43
Signed-off-by: WenHan Gu <Wenhan.gu@mediatek.com>
2 files changed