Revert "[LV] Inline CreateSplatIV call for scalar VFs (NFC)."

Causes a crash with the following (creduce'd) test-case:

clang -O3 '--target=aarch64-grtev4-linux-gnu' -xc - -c -o /dev/null <<EOF
int *e;
int f;
int g() {
  int h;
  int *j = 0;
  while (&f - j > 0) {
    int k;
    k = j;
    if (e == j && *e)
      k = 5;
    h = k;
    j++;
  }
  return h;
}
EOF

This reverts commit 7ce48be0.