Fix broken use of Int8 as boolean in codegen test

0737032 was pushed straight to master without going through CI
or even local testing

Author: tkelman

test/codegen.jl

@@ -3,7 +3,7 @@
 # tests for codegen and optimizations
 
 const opt_level = Base.JLOptions().opt_level
-const coverage = Base.JLOptions().code_coverage || Base.JLOptions().malloc_log
+const coverage = Bool(Base.JLOptions().code_coverage) || Bool(Base.JLOptions().malloc_log)
 const Iptr = sizeof(Int) == 8 ? "i64" : "i32"
 
 # `_dump_function` might be more efficient but it doesn't really matter here...