Properly store 128-bit constant in large model

Properly store 128-bit constant in large model

When converting TI store with CONST_INT to V1TI store with CONST_VECTOR
in large model, an extra instruction may be needed to load CONST_VECTOR
into a register.  Insert the extra instruction to the right place.

gcc/

	PR target/79498
	* config/i386/i386.c (timode_scalar_chain::convert_insn): Insert
	the extra instruction to the right place to store 128-bit constant
	when needed.

gcc/testsuite/

	PR target/79498
	* gcc.target/i386/pr79498.c: New test.

From-SVN: r245438