[turbofan] ARM: Reduce out-of-line NaN code size

src/arm/simulator-arm.cc

 // 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.
 
 #include <stdarg.h>
 #include <stdlib.h>
 #include <cmath>
 
 #if V8_TARGET_ARCH_ARM
 
@@ skipping 3197 matching lines @@
           float sm_value = get_float_from_s_register(m);
           float sd_value = fast_sqrt(sm_value, isolate_);
           sd_value = canonicalizeNaN(sd_value);
           set_s_register_from_float(d, sd_value);
         }
       } else if (instr->Opc3Value() == 0x0) {
         // vmov immediate.
         if (instr->SzValue() == 0x1) {
           set_d_register_from_double(vd, instr->DoubleImmedVmov());
         } else {
-          UNREACHABLE();  // Not used by v8.
+          set_s_register_from_float(d, instr->DoubleImmedVmov());
         }
       } else if (((instr->Opc2Value() == 0x6)) && (instr->Opc3Value() == 0x3)) {
         // vrintz - truncate
         if (instr->SzValue() == 0x1) {
           double dm_value = get_double_from_d_register(vm);
           double dd_value = trunc(dm_value);
           dd_value = canonicalizeNaN(dd_value);
           set_d_register_from_double(vd, dd_value);
         } else {
           float sm_value = get_float_from_s_register(m);
@@ skipping 997 matching lines @@
   set_register(sp, current_sp + sizeof(uintptr_t));
   return address;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // USE_SIMULATOR
 
 #endif  // V8_TARGET_ARCH_ARM