Handle old LLVM pass manager on rustc 1.57 #197
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The new LLVM pass manager was not enabled in rustc 1.57 as expected: rust-lang/rust#91263
The proposed fix to only pass
-C passes=sancov-moduleto nightly compilers for which the LLVM version is >= 13.Closes #192
@taiki-e Perhaps you could look this over.