[PATCH] [arm] Add softvfp to supported FPU names.

[Logan Chien]

  According to the "Addenda to the ABI for the ARM architecture", the default value for Tag_FP_arch is not allowed, which means that the generated object should not use VFP instructions.  Thus, I think it is OK to omit this build attribute.

  BTW, I am not very sure for the situation for Tag_DIV_use.  It seems that Tag_DIV_use is not related to softvfp.  The latest GNU assembler does not emit this build attribute, but the older version did so.  Should I add this attribute for softvfp?  Thanks.

http://llvm-reviews.chandlerc.com/D2413