nir/opt_algebraic: remove broken fddx/fddy patterns

These patterns are broken in the following scenario:

%1 = f2fmp %0
%2 = fddx %1
%3 = ... // non quad uniform
if %3 {
   %4 = f2f32 %2
   ...
}

Which would turn into

%3 = ...
if %3 {
   %4 = fddx %0
   ...
}

Yet another example that shows why derivative instructions should be
be intrinsics, not alu.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25014>
(cherry picked from commit 136a698251)

.pick_status.json

@@ -643,7 +643,7 @@
         "description": "nir/opt_algebraic: remove broken fddx/fddy patterns",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null
     },

src/compiler/nir/nir_opt_algebraic.py

@@ -3102,8 +3102,7 @@ for op in ['ffma', 'ffmaz']:
 # first eliminate temporary up-conversions such as in op1(f2fmp(f2f32(op2()))).
 #
 # Unary opcodes
-for op in ['fabs', 'fceil', 'fcos', 'fddx', 'fddx_coarse', 'fddx_fine', 'fddy',
-           'fddy_coarse', 'fddy_fine', 'fexp2', 'ffloor', 'ffract', 'flog2', 'fneg',
+for op in ['fabs', 'fceil', 'fcos', 'fexp2', 'ffloor', 'ffract', 'flog2', 'fneg',
            'frcp', 'fround_even', 'frsq', 'fsat', 'fsign', 'fsin', 'fsqrt']:
     late_optimizations += [(('~f2f32', (op, ('f2fmp', a))), (op, a))]