Disable dead test code.

Author: maleadt

test/native_tests.jl

@@ -474,11 +474,7 @@ end
     mod = @eval module $(gensym())
         using ..GPUCompiler
 
-        @static if isdefined(Base.Experimental, Symbol("@overlay"))
         Base.Experimental.@MethodTable(method_table)
-        else
-        const method_table = nothing
-        end
 
         kernel() = child()
         child() = 0

test/native_testsetup.jl

@@ -8,11 +8,7 @@ using GPUCompiler
 include("runtime.jl")
 
 # local method table for device functions
-@static if isdefined(Base.Experimental, Symbol("@overlay"))
 Base.Experimental.@MethodTable(test_method_table)
-else
-const test_method_table = nothing
-end
 
 struct CompilerParams <: AbstractCompilerParams
     entry_safepoint::Bool