Rust: Make 'tree'-level 'MAIN_NAME_P' work

'gcc/tree.h':

    #define main_identifier_node		global_trees[TI_MAIN_IDENTIFIER]
    #define MAIN_NAME_P(NODE) \
      (IDENTIFIER_NODE_CHECK (NODE) == main_identifier_node)

..., which is not initialized by default, but has to be set up by every front
end individually.  'MAIN_NAME_P' enables certain code optimizations, but is
especially also relevant for back ends that emit additional program entry setup
code for 'main'.

	gcc/rust/
	* backend/rust-compile-base.cc (HIRCompileBase::compile_function):
	Handle 'main' specially.
	* rust-lang.cc (grs_langhook_init): Initialize
	'main_identifier_node'.

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