ARM: support emission of complex SO expressions

Support to the IAS was added to actually parse and handle the complex SO
expressions.  However, the object file lowering was not updated to compensate
for the fact that the shift operand may be an absolute expression.

When trying to assemble to an object file, the lowering would fail while
succeeding when emitting purely assembly.  Add an appropriate test.

The test case is inspired by the test case provided by Jiangning Liu who also
brought the issue to light.

llvm-svn: 203762

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