sparse linear instruction offset for memops

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Hi

I am investigating a crash in the avltree test program I mentioned
before. I noticed the following:

Linearised output:

 load.64     %r338 <- -16[%r333]

LLVM output:

  %10 = getelementptr inbounds i8, i8* %9, i64 4294967280

Instead of -16 we are getting a garbage offset. This appears to be
caused by the fact that the offset field in the instruction is
unsigned. Should the offset be a signed field instead?

Regards
Dibyendu
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