Set inline-unit-growth to 40

[Jan Hubicka <hubicka@ucw.cz>]

Hello,
this patch sets inline-unit-growth to 40.  The performance changes are
- Firefox, LTO
  https://treeherder.mozilla.org/perf.html#/compare?originalProject=try&originalRevision=f7bd026e1a931b9a284d1c85c2577a72dd592820&newProject=try&newRevision=74889968abcc688b8d161863566ed273c0401ee4&framework=1&filter=opt&showOnlyComparable=1&showOnlyImportant=1
  After fixes to inlining priorities this makes difference without
  profile feedback only.

  Code size growth is about 9.15% with LTO and 3.95 with LTO and profile
  feedback.
- Firefox noLTO
  https://treeherder.mozilla.org/perf.html#/compare?originalProject=try&originalRevision=c902b72340a3dca3114f58578c1c8f3e6a1cd89c&newProject=try&newRevision=4974da6f92c144a9c09765b56a564a640069ddb9&framework=1&showOnlyComparable=1&showOnlyImportant=1
  With about 7% code size growth
- SPEC
  https://lnt.opensuse.org/db_default/v4/CPP/latest_runs_report?num_runs=10&min_percentage_change=0.02&revisions=46e2bd1143b5c60af814916d7673879b34ceb3f6%2Cc0d79cfe9c4ec30823480f2f9b256600e8e3899f
- C++ benchmarks
  https://lnt.opensuse.org/db_default/v4/SPEC/latest_runs_report?num_runs=10&all_changes=on&min_percentage_change=0.02&revisions=46e2bd1143b5c60af814916d7673879b34ceb3f6%2Cc0d79cfe9c4ec30823480f2f9b256600e8e3899f

I am not entirely happy about the code-size/performance tradeoffs but it
is concerned only for programs built with -O3 or having too many inline
keywords.  I have looked into inlining decisions for Firefox, HHVM and
Clang and inliner gets out of growt bounds way too early and some of
more performance aware projects already sets the limit up.

I will tune other metrics down to handle some of the code size problems.

Honza

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 267882)
+++ ChangeLog	(working copy)
@@ -1,3 +1,7 @@
+2019-01-05  Jan Hubicka  <hubicka@ucw.cz>
+
+	* params.def (inline-unit-growth): Set to 40.
+
 2019-01-12  Jakub Jelinek  <jakub@redhat.com>
 
 	* tree-ssa-loop-ivopts.c (find_inv_vars): Fix a comment typo.
Index: params.def
===================================================================
--- params.def	(revision 267882)
+++ params.def	(working copy)
@@ -227,7 +227,7 @@ DEFPARAM(PARAM_LARGE_UNIT_INSNS,
 DEFPARAM(PARAM_INLINE_UNIT_GROWTH,
 	 "inline-unit-growth",
 	 "How much can given compilation unit grow because of the inlining (in percent).",
-	 20, 0, 0)
+	 40, 0, 0)
 DEFPARAM(PARAM_IPCP_UNIT_GROWTH,
 	 "ipcp-unit-growth",
 	 "How much can given compilation unit grow because of the interprocedural constant propagation (in percent).",