[ARM] hard VFP calling convention support [1/3]

[Richard Earnshaw]

This is the part of the patch that needs approval from another
maintainer.

	* target-def.h (TARGET_LIBCALL_VALUE): New hook.
	* target.h (gcc_target): Add libcall_value to table of call hooks.
	* targhooks.h (default_libcall_value): Default implementation.
	* targhooks.c (default_libcall_value): Likewise.
	* doc/tm.texi (TARGET_LIBCALL_VALUE): Document it.
	* optabs.c (expand_unop): Use it.
	* expr.h (hard_libcall_value): Pass the function RTX through.
	* calls.c (emit_library_call_value_1): Update call to 
	hard_libcall_value.
	* explow.c (hard_libcall_value): Use new target hook.

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