[llvm] [CodeGen] Regen some old tests; NFC (PR #91250)

[Ulrich Weigand via llvm-commits]

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@@ -6,10 +7,6 @@ declare i64 @foo()
 
 ; Check sign-extended multiplication in which only the high part is used.
 define i64 @f1(i64 %dummy, i64 %a, i64 %b) {
-; CHECK-LABEL: f1:
-; CHECK-NOT: {{%r[234]}}
-; CHECK: mgrk %r2, %r3, %r4
-; CHECK: br %r14
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uweigand wrote:

This looks broken, it just removes all the actual checks in this test case?

https://github.com/llvm/llvm-project/pull/91250