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refactor and regularise label/statement grammar
Refactoring of the grammar around statements. New production <barestmt>
encompasses a statement without label. It includes all statement types,
including declarations, with no unnecessary intermediate non-terminals.
It generates an op tree for the statement's content, with no leading
state op. The <fullstmt> production has just one rule, consisting of
optional label followed by <barestmt>. It puts a state op on the front
of the statement's content ops.
To support the regular statement op structure, the op sequence for for(;;)
loops no longer has a second state op between the initialisation and
the loop. Instead, the unstack op type is slightly adapted to achieve
the stack clearing without a state op.
The newFOROP() constructor function no longer generates a state op,
that now being the job of the <fullstmt> production. Consequently it
no longer takes a parameter stating what label is to go in the state op.
This brings it in line with the other op constructors.
13 files changed: