[PowerPC] Load two floats directly instead of using one 64-bit integer load

When dealing with complex<float>, and similar structures with two
single-precision floating-point numbers, especially when such things are being
passed around by value, we'll sometimes end up loading both float values by
extracting them from one 64-bit integer load. It looks like this:

  t13: i64,ch = load<LD8[%ref.tmp]> t0, t6, undef:i64
      t16: i64 = srl t13, Constant:i32<32>
    t17: i32 = truncate t16
  t18: f32 = bitcast t17
    t19: i32 = truncate t13
  t20: f32 = bitcast t19

The problem, especially before the P8 where those bitcasts aren't legal (and
get expanded via the stack), is that it would have been better to use two
floating-point loads directly. Here we add a target-specific DAGCombine to do
just that. In short, we turn:

	ld 3, 0(5)
	stw 3, -8(1)
	rldicl 3, 3, 32, 32
	stw 3, -4(1)
	lfs 3, -4(1)
	lfs 0, -8(1)

into:

        lfs 3, 4(5)
        lfs 0, 0(5)

llvm-svn: 264988