[llvm] [LV][NFC] Remove "REQUIRES: asserts" line from some tests (PR #191795)

[David Sherwood via llvm-commits]

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@@ -32,8 +31,8 @@
 ; We can vectorize this loop because we are storing an invariant value into an
 ; invariant address.
 
-; CHECK: LV: We can vectorize this loop!
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david-arm wrote:

This line was simply testing that a) we don't crash, and b) we pass legality checks. Instead of relying upon debug output for this one case, I've simply forced the vector width to 4 and now testing that we generate a vector loop. This also tests a) and b), but without relying upon debug.

https://github.com/llvm/llvm-project/pull/191795