re PR target/45670 (Less efficient x86 addressing mode selection on 4.6, causes -Os size regression from 4.5)

	PR target/45670
	* expr.c (expand_expr_real_1) <case MEM_REF>: Use EXPAND_SUM
	instead of EXPAND_NORMAL for base expansion.

	* gcc.target/i386/pr45670.c: New test.

From-SVN: r166371