all: ensure b.ReportAllocs() in all the benchmarks (cosmos#8460)

With this change, we'll get details on the number of
allocations performed by code. Later on when we have
continuous benchmarking infrastructure, this change
will prove useful to flag regressions.

Fixes cosmos#8459

Co-authored-by: Alessio Treglia <alessio@tendermint.com>

sim_bench_test.go

@@ -14,6 +14,7 @@ import (
 // Profile with:
 // /usr/local/go/bin/go test -benchmem -run=^$ github.com/cosmos/cosmos-sdk/simapp -bench ^BenchmarkFullAppSimulation$ -Commit=true -cpuprofile cpu.out
 func BenchmarkFullAppSimulation(b *testing.B) {
+	b.ReportAllocs()
 	config, db, dir, logger, _, err := SetupSimulation("goleveldb-app-sim", "Simulation")
 	if err != nil {
 		b.Fatalf("simulation setup failed: %s", err.Error())
@@ -57,6 +58,7 @@ func BenchmarkFullAppSimulation(b *testing.B) {
 }
 
 func BenchmarkInvariants(b *testing.B) {
+	b.ReportAllocs()
 	config, db, dir, logger, _, err := SetupSimulation("leveldb-app-invariant-bench", "Simulation")
 	if err != nil {
 		b.Fatalf("simulation setup failed: %s", err.Error())