parfor keyword and infrastructure, but handle parfor as normal for loop for now * octave.gperf (octave_kw_id): New keyword ids, parfor_kw and end_parfor_kw. (octave_kw): Add parfor and end_parfor to the struct. * lex.ll (is_keyword_token): Handle parfor and end_parfor. * token.h (token::parfor_end): New end_tok_type enum value. * oct-parse.yy (PARFOR): New token. (loop_command): Handle PARFOR statements. (make_for_command): New args tok_id and maxproc. Handle PARFOR loops. * pt-loop.h (tree_simple_for_command::parallel, tree_simple_for_command:maxproc): New data members. (tree_simple_for_command::tree_simple_for_command): New args parallel_arg and maxproc_arg. Initialize new data members. (tree_simple_for_command::parallel): New function. (tree_simple_for_command::maxproc_expr): New function. * pt-loop.cc (tree_simple_for_command::~tree_simple_for_command): Delete maxproc. (tree_simple_for_command::dup): Pass parallel and maxproc to constructor for duplicate object. * pt-pr-code.cc (tree_print_code::visit_simple_for_command): Handle parallel form. * pt-check.cc (tree_checker::visit_simple_for_command): Likewise. * pt-eval.cc (tree_evaluator::visit_simple_for_command): Note that this is where parallel loops need to be handled.

--- a/src/octave.gperf
+++ b/src/octave.gperf
@@ -35,6 +35,7 @@
   else_kw,
   elseif_kw,
   end_kw,
+  end_parfor_kw,
   end_try_catch_kw,
   end_unwind_protect_kw,
   endclassdef_kw,
@@ -56,6 +57,7 @@
   magic_line_kw,
   methods_kw,
   otherwise_kw,
+  parfor_kw,
   properties_kw,
   return_kw,
   set_kw,
@@ -79,6 +81,7 @@
 else, ELSE, else_kw
 elseif, ELSEIF, elseif_kw
 end, END, end_kw
+end_parfor, END, end_parfor_kw
 end_try_catch, END, end_try_catch_kw
 end_unwind_protect, END, end_unwind_protect_kw
 endclassdef, END, endclassdef_kw 
@@ -98,6 +101,7 @@
 if, IF, if_kw
 methods, METHODS, methods_kw
 otherwise, OTHERWISE, otherwise_kw
+parfor, PARFOR, parfor_kw
 persistent, STATIC, static_kw
 properties, PROPERTIES, properties_kw
 return, FUNC_RET, return_kw