Cache the runtime library in memory.

[maleadt]

Helps with #698

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.12%. Comparing base (046ceba) to head (b1f8912).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/spirv.jl	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #699      +/-   ##
==========================================
- Coverage   73.80%   72.12%   -1.69%     
==========================================
  Files          24       24              
  Lines        3486     3483       -3     
==========================================
- Hits         2573     2512      -61     
- Misses        913      971      +58     

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diff --git a/src/spirv.jl b/src/spirv.jl
index 2afd4f6..147ddb2 100644
--- a/src/spirv.jl
+++ b/src/spirv.jl
@@ -169,11 +169,15 @@ end
     optimized = tempname(cleanup=false) * ".spv"
     if job.config.target.optimize
         try
-            run(```$(SPIRV_Tools_jll.spirv_opt()) -O --skip-validation
-                                                  $translated -o $optimized```)
+            run(
+                ```$(SPIRV_Tools_jll.spirv_opt()) -O --skip-validation
+                $translated -o $optimized```
+            )
         catch
-            error("""Failed to optimize generated SPIR-V.
-                     If you think this is a bug, please file an issue and attach $(input) and $(translated).""")
+            error(
+                """Failed to optimize generated SPIR-V.
+                If you think this is a bug, please file an issue and attach $(input) and $(translated)."""
+            )
         end
     else
         cp(translated, optimized)