Add preference to enable Tracy and disable by default

[vchuravy]

Should hopefully fix #742

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diff --git a/src/GPUCompiler.jl b/src/GPUCompiler.jl
index 72bf085..2260b07 100644
--- a/src/GPUCompiler.jl
+++ b/src/GPUCompiler.jl
@@ -20,8 +20,8 @@ const ENABLE_TRACY = parse(Bool, @load_preference("tracy", "false"))
 Activate tracy in the current environment.
 You will need to restart your Julia environment for it to take effect.
 """
-function enable_tracy!(state::Bool=true)
-    @set_preferences!("tracy"=>string(state))
+function enable_tracy!(state::Bool = true)
+    return @set_preferences!("tracy" => string(state))
 end
 
 if ENABLE_TRACY
diff --git a/test/aqua.jl b/test/aqua.jl
index 54c6510..ebbbe3e 100644
--- a/test/aqua.jl
+++ b/test/aqua.jl
@@ -1,4 +1,6 @@
 using Aqua
 
-Aqua.test_all(GPUCompiler;
-    stale_deps=(ignore=[:Tracy],),)
+Aqua.test_all(
+    GPUCompiler;
+    stale_deps = (ignore = [:Tracy],),
+)

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.72%. Comparing base (531dccd) to head (25adc4c).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/GPUCompiler.jl	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #745      +/-   ##
==========================================
- Coverage   75.28%   74.72%   -0.57%     
==========================================
  Files          24       24              
  Lines        3670     3675       +5     
==========================================
- Hits         2763     2746      -17     
- Misses        907      929      +22     

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[maleadt]

That's unfortunate. Is that kind of overhead expected?