Addresses the issue found by:
https://lab.llvm.org/buildbot/#/builders/30/builds/35886
GFX9-GFX11.
Code that manipulates the stack values in other lanes of a wavefront,
- such as by `addrspacecast`ing stack pointers to generic ones and taking offsets
+ such as by ``addrspacecast``-ing stack pointers to generic ones and taking offsets
that reach other lanes or by explicitly constructing the scratch buffer descriptor,
triggers undefined behavior when it modifies the scratch values of other lanes.
The compiler may assume that such modifications do not occur.