VM: Separate precompilation-specific code, make flags const.

runtime/vm/flag_list.h

Index: runtime/vm/flag_list.h
diff --git a/runtime/vm/flag_list.h b/runtime/vm/flag_list.h
index 00a2caf040b97696913149641e01bd0bb7b1e02a..4fdfb7b494130cef7a4b1beeab85e4fdc82db4ff 100644
--- a/runtime/vm/flag_list.h
+++ b/runtime/vm/flag_list.h
@@ -12,8 +12,15 @@
 // * D ebug flags: Can only be set in debug VMs, which also have assertions
 //   enabled.
 // * R elease flags: Generally available flags except when building product.
-
-#define FLAG_LIST(P, R, D)                                                     \
+// * pre C ompile flags: Generally available flags except when building product
+//   or precompiled runtime.
+//
+// Usage:
+//   P(name, type, default_value, comment)
+//   D(name, type, default_value, comment)
+//   R(name, product_value, type, default_value, comment)
+//   C(name, precompiled_value, product_value, type, default_value, comment)
+#define FLAG_LIST(P, R, D, C)                                                  \
 R(dedup_instructions, true, bool, false,                                       \
   "Canonicalize instructions when precompiling.")                              \
 R(disable_alloc_stubs_after_gc, false, bool, false,                            \
@@ -28,8 +35,22 @@ R(enable_mirrors, false, bool, true,                                           \
   "Disable to make importing dart:mirrors an error.")                          \
 R(gc_at_alloc, false, bool, false,                                             \
   "GC at every allocation.")                                                   \
+P(getter_setter_ratio, int, 13,                                                \
+  "Ratio of getter/setter usage used for double field unboxing heuristics")    \
+P(guess_icdata_cid, bool, true,                                                \
+  "Artificially create type feedback for arithmetic etc. operations")          \
+C(lazy_dispatchers, false, true, bool, true,                                   \
+  "Generate dispatchers lazily")                                               \
+P(max_polymorphic_checks, int, 4,                                              \
+  "Maximum number of polymorphic check, otherwise it is megamorphic.")         \
+P(max_equality_polymorphic_checks, int, 32,                                    \
+    "Maximum number of polymorphic checks in equality operator,")              \
+P(merge_sin_cos, bool, false,                                                  \
+  "Merge sin/cos into sincos")                                                 \
 P(new_gen_ext_limit, int, 64,                                                  \
   "maximum total external size (MB) in new gen before triggering GC")          \
+C(polymorphic_with_deopt, false, true, bool, true,                             \
+    "Polymorphic calls with deoptimization / megamorphic call")                \
 R(pretenure_all, false, bool, false,                                           \
   "Global pretenuring (for testing).")                                         \
 P(pretenure_interval, int, 10,                                                 \
@@ -54,10 +75,20 @@ R(support_coverage, false, bool, true,                                         \
   "Support code coverage.")                                                    \
 R(support_timeline, false, bool, true,                                         \
   "Support timeline.")                                                         \
+D(trace_cha, bool, false,                                                      \
+  "Trace CHA operations")                                                      \
+D(trace_field_guards, bool, false,                                             \
+  "Trace changes in field's cids.")                                            \
 D(trace_handles, bool, false,                                                  \
   "Traces allocation of handles.")                                             \
+D(trace_optimization, bool, false,                                             \
+  "Print optimization details.");                                              \
 D(trace_zones, bool, false,                                                    \
   "Traces allocation sizes in the zone.")                                      \
+P(truncating_left_shift, bool, true,                                           \
+  "Optimize left shift to truncate if possible")                               \
+C(use_cha_deopt, false, true, bool, true,                                      \
+  "Use class hierarchy analysis even if it can cause deoptimization.")         \
 P(verbose_gc, bool, false,                                                     \
   "Enables verbose GC.")                                                       \
 P(verbose_gc_hdr, int, 40,                                                     \