Remove @noinline for Julia 1.6 / 1.7

Apparently call-site `@noinline` support was added in the same release
that `Base.donotdelete` was introduced (1.8), so trying to use this here
just leads to breakage.

Author: topolarity

src/LinuxPerf.jl

@@ -1146,7 +1146,7 @@ macro pstats(args...)
                     Base.donotdelete(val)
                     stats = Stats(bench)
                 else
-                    stats = (@noinline rand()) < 0 ? val : Stats(bench)
+                    stats = rand() < 0 ? val : Stats(bench)
                 end
                 return stats::Stats
             catch