[PATCH] Add missing tests for build attribute encodings in object files.

[Charlie Turner]

`test/MC/ARM/directive-eabi_attribute.s` was missing several tests of object file encodings relative to the existing tests for assembly file encodings. This commit adds the missing tests.

There is a small wrinkle adding object file tests for the following pair of assembly file tests,

```
 	.eabi_attribute Tag_compatibility, 1
 @ CHECK: .eabi_attribute 32, 1
 	.eabi_attribute Tag_compatibility, 1, "aeabi"
 @ CHECK: .eabi_attribute 32, 1, "aeabi"
```

because the object file encoder removes duplicate build attrs (delete all but the first occurrence AFAICT), whereas the assembly encoder does allow duplicate attrs. The object file test I used for the second of the above build attributes does cover both code paths, so it tests the same code as the pair of tests above.

http://reviews.llvm.org/D6093

Files:
  test/MC/ARM/directive-eabi_attribute.s
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