PPC64: Adjust simulator stack safety margin.

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 710 matching lines @@
 #if defined(V8_TARGET_ARCH_ARM64) || defined(V8_TARGET_ARCH_MIPS64) || \
     defined(V8_TARGET_ARCH_PPC64)
 DEFINE_INT(sim_stack_alignment, 16,
            "Stack alignment in bytes in simulator. This must be a power of two "
            "and it must be at least 16. 16 is default.")
 #else
 DEFINE_INT(sim_stack_alignment, 8,
            "Stack alingment in bytes in simulator (4 or 8, 8 is default)")
 #endif
 DEFINE_INT(sim_stack_size, 2 * MB / KB,
-           "Stack size of the ARM64 and MIPS64 simulator "
+           "Stack size of the ARM64, MIPS64 and PPC64 simulator "
            "in kBytes (default is 2 MB)")
 DEFINE_BOOL(log_regs_modified, true,
             "When logging register values, only print modified registers.")
 DEFINE_BOOL(log_colour, true, "When logging, try to use coloured output.")
 DEFINE_BOOL(ignore_asm_unimplemented_break, false,
             "Don't break for ASM_UNIMPLEMENTED_BREAK macros.")
 DEFINE_BOOL(trace_sim_messages, false,
             "Trace simulator debug messages. Implied by --trace-sim.")
 
 // isolate.cc
@@ skipping 327 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