Improve positions tracking inside the HGraphBuilder.

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 804 matching lines @@
               "AArch64 instruction statistics log file.")
 DEFINE_int(log_instruction_period, 1 << 22,
            "AArch64 instruction statistics logging period.")
 
 DEFINE_bool(redirect_code_traces, false,
             "output deopt information and disassembly into file "
             "code-<pid>-<isolate id>.asm")
 DEFINE_string(redirect_code_traces_to, NULL,
             "output deopt information and disassembly into the given file")
 
+DEFINE_bool(hydrogen_track_positions, false,
+            "track source code positions when building IR")
+
 //
 // Disassembler only flags
 //
 #undef FLAG
 #ifdef ENABLE_DISASSEMBLER
 #define FLAG FLAG_FULL
 #else
 #define FLAG FLAG_READONLY
 #endif
 
@@ skipping 12 matching lines @@
             "test primary stub cache by disabling the secondary one")
 
 
 // codegen-ia32.cc / codegen-arm.cc
 DEFINE_bool(print_code, false, "print generated code")
 DEFINE_bool(print_opt_code, false, "print optimized code")
 DEFINE_bool(print_unopt_code, false, "print unoptimized code before "
             "printing optimized code based on it")
 DEFINE_bool(print_code_verbose, false, "print more information for code")
 DEFINE_bool(print_builtin_code, false, "print generated code for builtins")
-DEFINE_bool(emit_opt_code_positions, false,
-            "annotate optimize code with source code positions")
 
 #ifdef ENABLE_DISASSEMBLER
 DEFINE_bool(sodium, false, "print generated code output suitable for use with "
             "the Sodium code viewer")
 
 DEFINE_implication(sodium, print_code_stubs)
 DEFINE_implication(sodium, print_code)
 DEFINE_implication(sodium, print_opt_code)
-DEFINE_implication(sodium, emit_opt_code_positions)
+DEFINE_implication(sodium, hydrogen_track_positions)
 DEFINE_implication(sodium, code_comments)
 
 DEFINE_bool(print_all_code, false, "enable all flags related to printing code")
 DEFINE_implication(print_all_code, print_code)
 DEFINE_implication(print_all_code, print_opt_code)
 DEFINE_implication(print_all_code, print_unopt_code)
 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)
@@ skipping 32 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