isl_ast_codegen.c: create_node_scaled: inline call to isl_ast_graft_alloc_level
isl_ast_codegen.c: create_node_scaled: inline call to isl_ast_graft_alloc_level

Inlining the call will make it easier to control which constraints
go into the newly created graft guard in future commits.
In particular, we will want to add additional constraints to
the hoisted guard and use the result to simplify the guards
in the children.

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

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