Add perf test for inline array allocation

testsuite/tests/perf/should_run/InlineArrayAlloc.hs

+{-# LANGUAGE BangPatterns, MagicHash, UnboxedTuples #-}
+module Main where
+
+import GHC.Exts
+import GHC.IO
+
+main :: IO ()
+main = loop 10000000
+  where
+    loop :: Int -> IO ()
+    loop 0 = return ()
+    loop i = newArray >> loop (i-1)
+
+newArray :: IO ()
+newArray = IO $ \s -> case newArray# 16# () s of
+    (# s', _ #) -> (# s', () #)

testsuite/tests/perf/should_run/all.T

@@ -331,3 +331,9 @@ test('T7619',
      compile_and_run,
      ['-O'])
 
+test('InlineArrayAlloc',
+     [stats_num_field('bytes allocated',
+                      [ (wordsize(64), 1600040960, 5)]),
+      only_ways(['normal'])],
+     compile_and_run,
+     ['-O2'])