[llvm] [OFFLOAD] Extend olMemRegister API to handle cases when a memory block may have been mapped outside of liboffload. (PR #172226)

[Kevin Sala Penades via llvm-commits]

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@@ -735,24 +702,18 @@ class PinnedAllocationMapTy {
   Error unregisterHostBuffer(void *HstPtr);
 
   /// Lock the host buffer at \p HstPtr or register a new user if it intersects
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kevinsala wrote:

`Registers and optionally page-locks memory...`

https://github.com/llvm/llvm-project/pull/172226