Update LLVM test expectations for pointer argument attributes

[Copilot]

The DetectPointerArgOfFn analysis now automatically adds nocapture, readonly, writeonly, and readnone attributes to function pointer arguments based on usage analysis. Test CHECK lines needed updating to match the new output.

Changes

Updated 7 test files in enzyme/test/Enzyme/ReverseMode/:

• mallocuse.ll - Added nocapture writeonly and nocapture to augmented function parameters
• maskedload.ll, maskedload2.ll - Added readonly to pointer parameters that are only read
• maskedstore.ll, maskedstore2.ll - Added writeonly to pointer parameters that are only written
• memcpy-flt-tt.ll - Added nocapture writeonly/nocapture readonly to memory operation parameters
• loopcanon.ll - Added nocapture readonly to read-only pointer parameter

Example change:

; Before:
; CHECK: define internal { ptr, double } @augmented__take(ptr %a0, ptr %"a0'", i1 %a1)

; After:
; CHECK: define internal { ptr, double } @augmented__take(ptr nocapture writeonly %a0, ptr nocapture %"a0'", i1 %a1)

Fixes LLVM 15 Debug CI failures.

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