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This patch enables compiler-rt for the AArch32 target.  The code is
not used for AArch64 as the architecture supports the 64-bit division
and modulo operations natively.

Change-Id: I1703a92872b0bb56ac0b98c67193830683963b13
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

These are needed to provide division and modulo operations
for the AArch32 target.

This code is entirely unmodified.  Imported from compiler-rt
master branch as of May 4 2017.

Change-Id: I001e1809f2afd4bf8d4cc3d2296798809f607144
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>