Fix Turing performance tests

In v0.40 (or earlier?), TracedModel was moved from essential to
src/mcmc/particle_mcmc.jl.

Author: penelopeysm

perf/p0.jl

@@ -14,7 +14,7 @@ end
 
 # Case 1: Sample from the prior.
 rng = MersenneTwister()
-m = Turing.Core.TracedModel(gdemo(1.5, 2.0), SampleFromPrior(), VarInfo(), rng)
+m = Turing.Inference.TracedModel(gdemo(1.5, 2.0), SampleFromPrior(), VarInfo(), rng)
 f = m.evaluator[1];
 args = m.evaluator[2:end];
 
@@ -27,7 +27,7 @@ println("Run a tape...")
 @btime t.tf(args...)
 
 # Case 2: SMC sampler
-m = Turing.Core.TracedModel(gdemo(1.5, 2.0), Sampler(SMC(50)), VarInfo(), rng)
+m = Turing.Inference.TracedModel(gdemo(1.5, 2.0), Sampler(SMC(50)), VarInfo(), rng)
 f = m.evaluator[1];
 args = m.evaluator[2:end];
 

perf/p2.jl

@@ -52,7 +52,7 @@ Random.seed!(rng, 2)
 iterations = 500
 model_fun = infiniteGMM(data)
 
-m = Turing.Core.TracedModel(model_fun, Sampler(SMC(50)), VarInfo(), rng)
+m = Turing.Inference.TracedModel(model_fun, Sampler(SMC(50)), VarInfo(), rng)
 f = m.evaluator[1]
 args = m.evaluator[2:end]