The branch relaxation pass is computing the wrong offsets because it assumes TLSDESC_CALLSEQ eats up 4 bytes, when in fact it is lowered to an instruction sequence taking up 16 bytes. This can become a problem in huge files with lots of TLS accesses, as it may slowly move branch targets out of the range computed by the branch relaxation pass. Fixes PR24234 https://llvm.org/bugs/show_bug.cgi?id=24234 Differential Revision: https://reviews.llvm.org/D22870 llvm-svn: 277331
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