Update to new benchmarking framework (#126)

bls12_377/benches/bls12_377.rs

@@ -0,0 +1,16 @@
+use ark_algebra_bench_templates::*;
+
+use ark_bls12_377::{
+    fq::Fq, fq2::Fq2, fr::Fr, Bls12_377, Fq12, G1Projective as G1, G2Projective as G2,
+};
+
+bench!(
+    Name = "Bls12_377",
+    Pairing = Bls12_377,
+    G1 = G1,
+    G2 = G2,
+    ScalarField = Fr,
+    G1BaseField = Fq,
+    G2BaseField = Fq2,
+    TargetField = Fq12,
+);