Add atomic float support

[michel2323]

Enable SPV_EXT_shader_atomic_float_add
Fixes #508

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diff --git a/src/compiler/compilation.jl b/src/compiler/compilation.jl
index 33d7764..01d1815 100644
--- a/src/compiler/compilation.jl
+++ b/src/compiler/compilation.jl
@@ -70,7 +70,7 @@ end
     # TODO: emit printf format strings in constant memory
     extensions = String[
         "SPV_EXT_relaxed_printf_string_address_space",
-        "SPV_EXT_shader_atomic_float_add"
+        "SPV_EXT_shader_atomic_float_add",
     ]
 
     # create GPUCompiler objects

[michel2323]

Needs tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.10%. Comparing base (0c9c8b7) to head (fa63ecb).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #544   +/-   ##
=======================================
  Coverage   79.10%   79.10%           
=======================================
  Files          47       47           
  Lines        3001     3001           
=======================================
  Hits         2374     2374           
  Misses        627      627           

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