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A function that has a definition in the current translation unit will
have a non-NULL DECL_INITIAL. However, back-ends should not make
use of the particular value given by DECL_INITIAL.
The DECL_SAVED_TREE macro will give the complete body of the
function. This node will usually be a COMPOUND_STMT representing
the outermost block of the function, but it may also be a
TRY_BLOCK, a RETURN_INIT, or any other valid statement.