Update the description of MachineFrameInfo's OffsetAdjustment.  The value of this adjustment does not change the direction or the signs of the object offsets, and the details of the offset calculations can be target-specific. Also mention that for most targets this value is only used to generate debug info.
Update the description of MachineFrameInfo's OffsetAdjustment.  The value of
this adjustment does not change the direction or the signs of the object
offsets, and the details of the offset calculations can be target-specific.
Also mention that for most targets this value is only used to generate debug
info.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@82750 91177308-0d34-0410-b5e6-96231b3b80d8

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