[dev.ssa] cmd/compile/internal/ssa: fix complex compares

It was using 64-bit float comparison ops for complex64.
It should use 32-bit float comparison.

Fixes build.

Change-Id: I6452b227257fecc09e04cd092ccf328d1fc9917f
Reviewed-on: https://go-review.googlesource.com/14497
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/compile/internal/gc/ssa.go

@@ -1477,7 +1477,7 @@ func (s *state) expr(n *Node) *ssa.Value {
 		a := s.expr(n.Left)
 		b := s.expr(n.Right)
 		if n.Left.Type.IsComplex() {
-			pt := floatForComplex(n.Type)
+			pt := floatForComplex(n.Left.Type)
 			op := s.ssaOp(OEQ, pt)
 			r := s.newValue2(op, Types[TBOOL], s.newValue1(ssa.OpComplexReal, pt, a), s.newValue1(ssa.OpComplexReal, pt, b))
 			i := s.newValue2(op, Types[TBOOL], s.newValue1(ssa.OpComplexImag, pt, a), s.newValue1(ssa.OpComplexImag, pt, b))