Use the Nth impl when translating a static method call, instead

of the 0th.  0th is only correct when there are no bound tps
on the trait.

Fixes #3741.

src/test/run-pass/static-method-in-trait-with-tps-intracrate.rs

@@ -0,0 +1,25 @@
+trait Deserializer {
+    fn read_int() -> int;
+}
+
+trait Deserializable<D: Deserializer> {
+    static fn deserialize(d: &D) -> self;
+}
+
+impl<D: Deserializer> int: Deserializable<D> {
+    static fn deserialize(d: &D) -> int {
+        return d.read_int();
+    }
+}
+
+struct FromThinAir { dummy: () }
+
+impl FromThinAir: Deserializer {
+    fn read_int() -> int { 22 }
+}
+
+fn main() {
+    let d = FromThinAir { dummy: () };
+    let i: int = deserialize(&d);
+    assert i == 22;
+}