Merge pull request #48 from JuliaPerf/Zentrik/robust-donotdelete

More robustly prevent compiler from eliminating code to be benchmarked

Author: topolarity

src/LinuxPerf.jl

@@ -1142,7 +1142,12 @@ macro pstats(args...)
                 val = $(esc(expr))
                 disable_all!()
                 # trick the compiler not to eliminate the code
-                stats = rand() < 0 ? val : Stats(bench)
+                @static if isdefined(Base, :donotdelete)
+                    Base.donotdelete(val)
+                    stats = Stats(bench)
+                else
+                    stats = (@noinline rand()) < 0 ? val : Stats(bench)
+                end
                 return stats::Stats
             catch
                 rethrow()