[turbofan] Always inline small functions directly.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 06944a10f2dd143a5d2a8ad7fa35b5944ff78cad..949f919697c78e8019c663c4607220862efc1ce8 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -361,6 +361,8 @@ DEFINE_INT(max_inlined_nodes, 200,
            "maximum number of AST nodes considered for a single inlining")
 DEFINE_INT(max_inlined_nodes_cumulative, 400,
            "maximum cumulative number of AST nodes considered for inlining")
+DEFINE_INT(max_inlined_nodes_small, 10,
+           "maximum number of AST nodes considered for small function inlining")
 DEFINE_FLOAT(min_inlining_frequency, 0.15, "minimum frequency for inlining")
 DEFINE_BOOL(loop_invariant_code_motion, true, "loop invariant code motion")
 DEFINE_BOOL(fast_math, true, "faster (but maybe less accurate) math functions")