nir: Switch the arguments to nir_foreach_instr

This matches the "foreach x in container" pattern found in many other
programming languages.  Generated by the following regular expression:

s/nir_foreach_instr(\([^,]*\),\s*\([^,]*\))/nir_foreach_instr(\2, \1)/

and similar expressions for nir_foreach_instr_safe etc.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/compiler/nir/nir_lower_clip.c

@@ -100,7 +100,7 @@ load_clipdist_input(nir_builder *b, nir_variable *in, nir_ssa_def **val)
 static nir_ssa_def *
 find_output_in_block(nir_block *block, unsigned drvloc)
 {
-   nir_foreach_instr(block, instr) {
+   nir_foreach_instr(instr, block) {
 
       if (instr->type == nir_instr_type_intrinsic) {
          nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);