Fix test.

Author: rxwei

test/AutoDiff/differentiable_function_silgen.swift

@@ -84,5 +84,5 @@ func appliesReabstraction(_ f: @escaping @differentiable (Float) -> Float) {
 // CHECK-SILGEN:   [[REABS_VJP:%.*]] = function_ref @$sS4fIegyd_Iegydo_S4fIegnr_Iegnro_TR : $@convention(thin) (@in_guaranteed Float, @guaranteed @callee_guaranteed (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)) -> (@out Float, @owned @callee_guaranteed (@in_guaranteed Float) -> @out Float)
 // CHECK-SILGEN:   [[NEW_VJP:%.*]] = partial_apply [callee_guaranteed] [[REABS_VJP]]([[VJP_COPY]]) : $@convention(thin) (@in_guaranteed Float, @guaranteed @callee_guaranteed (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)) -> (@out Float, @owned @callee_guaranteed (@in_guaranteed Float) -> @out Float)
 // CHECK-SILGEN:   [[NEW_DIFF_FUNC:%.*]] = differentiable_function [wrt 0] [[NEW_ORIG]] : $@callee_guaranteed (@in_guaranteed Float) -> @out Float with {[[NEW_JVP]] : $@callee_guaranteed (@in_guaranteed Float) -> (@out Float, @owned @callee_guaranteed (@in_guaranteed Float) -> @out Float), [[NEW_VJP]] : $@callee_guaranteed (@in_guaranteed Float) -> (@out Float, @owned @callee_guaranteed (@in_guaranteed Float) -> @out Float)}
-// CHECK-SILGEN:   [[DIFF_API:%.*]] = function_ref @${{.*}}pullback{{.*}}at{{.*}} : $@convention(thin) <τ_0_0, τ_0_1 where τ_0_0 : Differentiable, τ_0_1 : Differentiable> (@in_guaranteed τ_0_0, @guaranteed @differentiable @callee_guaranteed (@in_guaranteed τ_0_0) -> @out τ_0_1) -> @owned @callee_guaranteed (@in_guaranteed τ_0_1.TangentVector) -> @out τ_0_0.TangentVector
-// CHECK-SILGEN:   apply [[DIFF_API]]<Float, Float>({{.*}}, [[NEW_DIFF_FUNC]]) : $@convention(thin) <τ_0_0, τ_0_1 where τ_0_0 : Differentiable, τ_0_1 : Differentiable> (@in_guaranteed τ_0_0, @guaranteed @differentiable @callee_guaranteed (@in_guaranteed τ_0_0) -> @out τ_0_1) -> @owned @callee_guaranteed (@in_guaranteed τ_0_1.TangentVector) -> @out τ_0_0.TangentVector
+// CHECK-SILGEN:   [[DIFF_API:%.*]] = function_ref @${{.*}}pullback{{.*}}at{{.*}} : $@convention(thin) <τ_0_0, τ_0_1 where τ_0_0 : _Differentiable, τ_0_1 : _Differentiable> (@in_guaranteed τ_0_0, @guaranteed @differentiable @callee_guaranteed (@in_guaranteed τ_0_0) -> @out τ_0_1) -> @owned @callee_guaranteed (@in_guaranteed τ_0_1.TangentVector) -> @out τ_0_0.TangentVector
+// HECK-SILGEN:   apply [[DIFF_API]]<Float, Float>({{.*}}, [[NEW_DIFF_FUNC]]) : $@convention(thin) <τ_0_0, τ_0_1 where τ_0_0 : _Differentiable, τ_0_1 : _Differentiable> (@in_guaranteed τ_0_0, @guaranteed @differentiable @callee_guaranteed (@in_guaranteed τ_0_0) -> @out τ_0_1) -> @owned @callee_guaranteed (@in_guaranteed τ_0_1.TangentVector) -> @out τ_0_0.TangentVector