poly_int: ipa_parm_adjustment

poly_int: ipa_parm_adjustment

This patch changes the type of ipa_parm_adjustment::offset from
HOST_WIDE_INT to poly_int64 and updates uses accordingly.

2017-12-20  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* ipa-param-manipulation.h (ipa_parm_adjustment::offset): Change from
	HOST_WIDE_INT to poly_int64_pod.
	* ipa-param-manipulation.c (ipa_modify_call_arguments): Track
	polynomail parameter offsets.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@255885 138bc75d-0d04-0410-961f-82ee72b054a4