functionControl internal option is documented but only the misspelled functonControl works

[pvelesko]

IGCInternalOptions.td:139 on master defines functonControl, while the comment on line 138 documents the option as -ze-intel-functionControl. The correctly spelled form is defined nowhere, and unknown internal options are accepted without a diagnostic, so it silently does nothing.

ocloc 26.27.39122.11, -device dg2. Still present on master at 321f361.

__attribute__((noinline)) int helper(global int *p, int i) { return p[i] * 3 + i; }
kernel void k(global int *o, global int *p) {
  int i = get_global_id(0);
  o[i] = helper(p, i) + helper(p, i + 1);
}

-internal_options	resulting fc_dg2.bin
none	5736 bytes
-cl-intel-functonControl 1	5952 bytes
-cl-intel-functionControl 1	5736 bytes, byte identical to none

I have a patch adding the documented spelling as an alias so the existing one keeps working, and can open a PR.