[PATCH] [mips] llvm-readobj can parse .MIPS.abiflags. No need to check the bytes.

[Simon Atanasyan]

In general the patch is LGTM. But maybe it is better to achieve the same result without making the `llvm-readobj` more verbose. The following string does not produce false positive result on `ISA: MIPS32r6` input:

  ISA: {{MIPS32$}}


http://reviews.llvm.org/D10538

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