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On Thumb, the displacement computation hardware uses the address of the current instruction rouned down to a multiple of 4. Include this rounding in the UserOffset we compute for each instruction. When inline asm is present, the instruction alignment may not be known. Constrain the maximum displacement instead in that case. This makes it possible for CreateNewWater() and OffsetIsInRange() to agree about the valid displacements. When they disagree, infinite looping happens. As always, test cases for this stuff are insane. <rdar://problem/10660175> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147825 91177308-0d34-0410-b5e6-96231b3b80d8
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