use Tracy instead of TimerOutputs

[vchuravy]

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diff --git a/src/GPUCompiler.jl b/src/GPUCompiler.jl
index 5d337e5..8752c95 100644
--- a/src/GPUCompiler.jl
+++ b/src/GPUCompiler.jl
@@ -65,7 +65,7 @@ function __init__()
     mkpath(dir)
     global compile_cache = dir
 
-    Tracy.@register_tracepoints()
+    return Tracy.@register_tracepoints()
 end
 
 end # module