[ARM] Complete enumeration values for Tag_ABI_VFP_args
[ARM] Complete enumeration values for Tag_ABI_VFP_args

The LLD implementation of Tag_ABI_VFP_args needs to check the rarely seen
values of 3 (toolchain specific) and 4 compatible with both Base and VFP.
Add the missing enumeration values so that LLD can refer to them without
having to use the raw numbers.

Differential Revision: https://reviews.llvm.org/D50049



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@338373 91177308-0d34-0410-b5e6-96231b3b80d8

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