* pa.h: Revise comments for TARGET_NO_SPACE_REGS and
	TARGET_FAST_INDIRECT_CALLS.
	* pa.c (override_options): TARGET_NO_SPACE_REGS is now OK with
	-fPIC.  Don't warn.
	(return_addr_rtx): Short circuit export stub matching when
	TARGET_NO_SPACE_REGS.
	(output_millicode_call): For out of range calls, make -fPIC
	take precedence, then TARGET_PORTABLE_RUNTIME, then ble.  Don't
	return before delay slot checks when TARGET_PORTABLE_RUNTIME.
	* pa.md: Modify length attr calculation of all millicode insns to
	match above.

From-SVN: r41042