[llvm] LoopVectorize/test: add missing CHECK lines, cleanup intrinsic.ll (PR #70202)

[Ramkumar Ramachandra via llvm-commits]

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@@ -506,7 +530,7 @@ for.body:                                         ; preds = %entry, %for.body
   %0 = load double, ptr %arrayidx, align 8
   %arrayidx1 = getelementptr inbounds double, ptr %z, i64 %indvars.iv
   %1 = load double, ptr %arrayidx, align 8
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artagnon wrote:

Excellent catch! Indeed, llvm.copysign.v4f64 should be matched by the fixed test.

https://github.com/llvm/llvm-project/pull/70202