Initial support for emitting unwinding information in perf jitdump.

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file defines all of the flags.  It is separated into different section,
 // for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
 // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
 //
 // This include does not have a guard, because it is a template-style include,
 // which can be included multiple times in different modes.  It expects to have
@@ skipping 1041 matching lines @@
             "Enable perf linux profiler (basic support).")
 DEFINE_NEG_IMPLICATION(perf_basic_prof, compact_code_space)
 DEFINE_BOOL(perf_basic_prof_only_functions, false,
             "Only report function code ranges to perf (i.e. no stubs).")
 DEFINE_IMPLICATION(perf_basic_prof_only_functions, perf_basic_prof)
 DEFINE_BOOL(perf_prof, false,
             "Enable perf linux profiler (experimental annotate support).")
 DEFINE_NEG_IMPLICATION(perf_prof, compact_code_space)
 DEFINE_BOOL(perf_prof_debug_info, false,
             "Enable debug info for perf linux profiler (experimental).")
+DEFINE_BOOL(perf_prof_unwinding_info, false,
+            "Enable unwinding info for perf linux profiler (experimental).")
 DEFINE_STRING(gc_fake_mmap, "/tmp/__v8_gc__",
               "Specify the name of the file for fake gc mmap used in ll_prof")
 DEFINE_BOOL(log_internal_timer_events, false, "Time internal events.")
 DEFINE_BOOL(log_timer_events, false,
             "Time events including external callbacks.")
 DEFINE_IMPLICATION(log_timer_events, log_internal_timer_events)
 DEFINE_IMPLICATION(log_internal_timer_events, prof)
 DEFINE_BOOL(log_instruction_stats, false, "Log AArch64 instruction statistics.")
 DEFINE_STRING(log_instruction_file, "arm64_inst.csv",
               "AArch64 instruction statistics log file.")
@@ skipping 124 matching lines @@
 #undef DEFINE_ALIAS_FLOAT
 #undef DEFINE_ALIAS_ARGS
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 
 #undef COMMA