[X86] Check return value of readSIB in disassembler so errors propagate. In particular this makes a too short instruction with a missing SIB byte fail.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204305 91177308-0d34-0410-b5e6-96231b3b80d8
Reapply 'ARM IAS: support .thumb_set'

Re-apply the change after it was reverted to do conflicts due to another change
being reverted.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204306 91177308-0d34-0410-b5e6-96231b3b80d8
Object: Don't double-escape empty hexdata

We would emit a pair of double quotes inside a pair of single quotes.
Just use a pair of single quotes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204312 91177308-0d34-0410-b5e6-96231b3b80d8
Object: Abstract out the determination of function line symbols

No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204313 91177308-0d34-0410-b5e6-96231b3b80d8
Object: Output .file symbols properly

obj2yaml would emit the NUL bytes padding the auxiliary file symbol
records.  Trimming them looks nicer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204314 91177308-0d34-0410-b5e6-96231b3b80d8
Test case for r204305.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204316 91177308-0d34-0410-b5e6-96231b3b80d8