Add the member integer_to_sse to processor_cost as a cost simulation for movd/pinsrd...

Add the member integer_to_sse to processor_cost as a cost simulation for movd/pinsrd. It will be used to calculate the cost of vec_construct.

gcc/ChangeLog:

	PR target/99881
	* config/i386/i386.h (processor_costs): Add new member
	integer_to_sse.
	* config/i386/x86-tune-costs.h (ix86_size_cost, i386_cost,
	i486_cost, pentium_cost, lakemont_cost, pentiumpro_cost,
	geode_cost, k6_cost, athlon_cost, k8_cost, amdfam10_cost,
	bdver_cost, znver1_cost, znver2_cost, znver3_cost,
	btver1_cost, btver2_cost, btver3_cost, pentium4_cost,
	nocona_cost, atom_cost, atom_cost, slm_cost, intel_cost,
	generic_cost, core_cost): Initialize integer_to_sse same value
	as sse_op.
	(skylake_cost): Initialize integer_to_sse twice as much as sse_op.
	* config/i386/i386.c (ix86_builtin_vectorization_cost):
	Use integer_to_sse instead of sse_op to calculate the cost of
	vec_construct.

gcc/testsuite/ChangeLog:

	PR target/99881
	* gcc.target/i386/pr99881.c: New test.