[PATCH] [ARM] Handle conflicts between -mfpu and -mfloat-abi options

[Asiri Rathnayake]

Hi Renato,

> 
> My concern was that you've only added tests for armv8, so for example, the CHECK-SOFT-FLOAT should probably check for -vfp* too.
> 

I already have the following tests:

```
// SOFT-ABI-FP: "-target-feature" "-neon"                                                                                                                                         
// SOFT-ABI-FP: "-target-feature" "-crypto"                                                                                                                                       
// SOFT-ABI-FP: "-target-feature" "-vfp2"                                                                                                                                         
// SOFT-ABI-FP: "-target-feature" "-vfp3"                                                                                                                                         
// SOFT-ABI-FP: "-target-feature" "-vfp4"
```

AFAICS The architecture does not play a role in determining the floating point ABI / ops. The underlying platform sometimes infer floating point ABI / ops, and I have a test for that (DEFAULT-FP).

Do you want me to add tests for pre-v8 architectures anyways?

Thanks!

--Asiri

http://reviews.llvm.org/D5460