[clang] [clang][bytecode] Add a CheckLoad overload taking a PtrView (PR #225741)

[Timm Baeder via cfe-commits]

tbaederr wrote:

This saves us 8% when compiling AttrDocTable.cpp: https://llvm-compile-time-tracker.com/compare_clang.php?from=23c9ff9ac50bcf438aeb79a59b55e396d3c9f2f5&to=52aac0aa5ac41e67eb0f41128f217f499523e6f7&stat=instructions%3Au&sortBy=interestingness

https://github.com/llvm/llvm-project/pull/225741