[Remarks] Update LV analysis remark frontend test to avoid switch.

Support for vectorizing switch statements will be added in
#99808.

Update the loop to use a call that cannot be vectorized to preserve
testing surfacing analysis remarks via the frontend.

Author: fhahn

clang/test/Frontend/optimization-remark-analysis.c

@@ -1,21 +1,14 @@
 // RUN: %clang -O1 -fvectorize -target x86_64-unknown-unknown -emit-llvm -Rpass-analysis -S %s -o - 2>&1 | FileCheck %s --check-prefix=RPASS
 // RUN: %clang -O1 -fvectorize -target x86_64-unknown-unknown -emit-llvm -S %s -o - 2>&1 | FileCheck %s
 
-// RPASS: {{.*}}:12:5: remark: loop not vectorized: loop contains a switch statement
-// CHECK-NOT: remark: loop not vectorized: loop contains a switch statement
+// RPASS: {{.*}}:12:5: remark: loop not vectorized: call instruction cannot be vectorized
+// CHECK-NOT: remark: loop not vectorized
 
-double foo(int N, int *Array) {
-  double v = 0.0;
+void bar(void);
 
+void foo(int N) {
   #pragma clang loop vectorize(enable)
   for (int i = 0; i < N; i++) {
-    switch(Array[i]) {
-    case 0: v += 1.0f; break;
-    case 1: v -= 0.5f; break;
-    case 2: v *= 2.0f; break;
-    default: v = 0.0f;
-    }
+    bar();
   }
-
-  return v;
 }