Adapt test for msan message change #101616
                
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Similar to #100445, this adapts the new test added by #99207 to some relatively recent LLVM changes that removed the function name from msan messages.
Found via our experimental rust + llvm @ HEAD bot:
https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds/13347#018321b2-0cc3-4c91-b4db-774477e8b074
@rustbot label +llvm-main