Push/pop is just one peephole optimization. Puth them all...

src/flag-definitions.h

 // Copyright 2008 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 82 matching lines @@
 
 //
 // Flags in all modes.
 //
 #define FLAG FLAG_FULL
 
 // assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc
 DEFINE_bool(debug_code, false,
             "generate extra code (comments, assertions) for debugging")
 DEFINE_bool(emit_branch_hints, false, "emit branch hints")
-DEFINE_bool(push_pop_elimination, true,
-            "eliminate redundant push/pops in assembly code")
-DEFINE_bool(print_push_pop_elimination, false,
-            "print elimination of redundant push/pops in assembly code")
 DEFINE_bool(peephole_optimization, true,
             "perform peephole optimizations in assembly code")
 DEFINE_bool(print_peephole_optimization, false,
             "print peephole optimizations in assembly code")
 DEFINE_bool(enable_sse2, true,
             "enable use of SSE2 instructions if available")
 DEFINE_bool(enable_sse3, true,
             "enable use of SSE3 instructions if available")
 DEFINE_bool(enable_cmov, true,
             "enable use of CMOV instruction if available")
@@ skipping 325 matching lines @@
 #undef FLAG
 
 #undef DEFINE_bool
 #undef DEFINE_int
 #undef DEFINE_string
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META