[cleanup] Remove dead flags

R=mstarzinger@chromium.org

Bug: v8:7109
Change-Id: Id5e5c653136dd0cb5d8dcd2cf61d7941ec7ff61b
Reviewed-on: https://chromium-review.googlesource.com/800075Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49757}

src/flag-definitions.h

@@ -456,8 +456,6 @@ DEFINE_BOOL(turbo_stress_instruction_scheduling, false,
 DEFINE_BOOL(turbo_store_elimination, true,
             "enable store-store elimination in TurboFan")
 DEFINE_BOOL(trace_store_elimination, false, "trace store elimination")
-DEFINE_BOOL(turbo_experimental, false,
-            "enable crashing features, for testing purposes only")
 DEFINE_BOOL(turbo_rewrite_far_jumps, true,
             "rewrite far to near jumps (ia32,x64)")
 
@@ -765,8 +763,6 @@ DEFINE_BOOL(force_slow_path, false, "always take the slow path for builtins")
 DEFINE_BOOL(inline_new, true, "use fast inline allocation")
 
 // codegen-ia32.cc / codegen-arm.cc
-DEFINE_BOOL(trace_codegen, false,
-            "print name of functions for which code is generated")
 DEFINE_BOOL(trace, false, "trace function calls")
 
 // codegen.cc
@@ -1227,9 +1223,6 @@ DEFINE_IMPLICATION(print_all_code, print_code_verbose)
 DEFINE_IMPLICATION(print_all_code, print_builtin_code)
 DEFINE_IMPLICATION(print_all_code, print_code_stubs)
 DEFINE_IMPLICATION(print_all_code, code_comments)
-#ifdef DEBUG
-DEFINE_IMPLICATION(print_all_code, trace_codegen)
-#endif
 #endif
 
 #undef FLAG

test/mjsunit/compiler/escape-analysis-13.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --turbo-escape --turbo-experimental
+// Flags: --allow-natives-syntax --turbo-escape
 
 function f() {
   var x = {};

test/mjsunit/compiler/escape-analysis-15.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --turbo-escape --turbo-experimental --no-turbo-load-elimination
+// Flags: --allow-natives-syntax --turbo-escape --no-turbo-load-elimination
 
 function f(i) {
   var o1 = {a: 1, b: 2};

test/mjsunit/compiler/escape-analysis-phi-type.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --turbo-escape --turbo-experimental --no-turbo-loop-peeling
+// Flags: --allow-natives-syntax --turbo-escape --no-turbo-loop-peeling
 
 function f(x) {
   var o = {a : 0};