remove alloca type from issue-105386-ub-in-debuginfo

It's irrelevant for the purposes of this test (there is only one alloca)
and its size changes depending on the target, so it can't be matched
easily.

tests/codegen/issues/issue-105386-ub-in-debuginfo.rs

@@ -15,7 +15,7 @@ pub fn outer_function(x: S, y: S) -> usize {
 // Check that we do not attempt to load from the spilled arg before it is assigned to
 // when generating debuginfo.
 // CHECK-LABEL: @outer_function
-// CHECK: [[spill:%.*]] = alloca [72 x i8]
+// CHECK: [[spill:%.*]] = alloca
 // CHECK-NOT: [[ptr_tmp:%.*]] = getelementptr inbounds i8, ptr [[spill]]
 // CHECK-NOT: [[load:%.*]] = load ptr, ptr
 // CHECK: call void @llvm.lifetime.start{{.*}}({{.*}}, ptr [[spill]])