Array length reduction should throw in strict mode if it can't delete an element.

src/arm/macro-assembler-arm.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.
 
 #ifndef V8_ARM_MACRO_ASSEMBLER_ARM_H_
 #define V8_ARM_MACRO_ASSEMBLER_ARM_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 298 matching lines @@
       SmiCheck smi_check = INLINE_SMI_CHECK,
       PointersToHereCheck pointers_to_here_check_for_value =
           kPointersToHereMaybeInteresting);
 
   // Push a handle.
   void Push(Handle<Object> handle);
   void Push(Smi* smi) { Push(Handle<Smi>(smi, isolate())); }
 
   // Push two registers.  Pushes leftmost register first (to highest address).
   void Push(Register src1, Register src2, Condition cond = al) {
-    DCHECK(!src1.is(src2));
     if (src1.code() > src2.code()) {
       stm(db_w, sp, src1.bit() | src2.bit(), cond);
     } else {
       str(src1, MemOperand(sp, 4, NegPreIndex), cond);
       str(src2, MemOperand(sp, 4, NegPreIndex), cond);
     }
   }
 
   // Push three registers.  Pushes leftmost register first (to highest address).
   void Push(Register src1, Register src2, Register src3, Condition cond = al) {
-    DCHECK(!AreAliased(src1, src2, src3));
     if (src1.code() > src2.code()) {
       if (src2.code() > src3.code()) {
         stm(db_w, sp, src1.bit() | src2.bit() | src3.bit(), cond);
       } else {
         stm(db_w, sp, src1.bit() | src2.bit(), cond);
         str(src3, MemOperand(sp, 4, NegPreIndex), cond);
       }
     } else {
       str(src1, MemOperand(sp, 4, NegPreIndex), cond);
       Push(src2, src3, cond);
     }
   }
 
   // Push four registers.  Pushes leftmost register first (to highest address).
   void Push(Register src1,
             Register src2,
             Register src3,
             Register src4,
             Condition cond = al) {
-    DCHECK(!AreAliased(src1, src2, src3, src4));
     if (src1.code() > src2.code()) {
       if (src2.code() > src3.code()) {
         if (src3.code() > src4.code()) {
           stm(db_w,
               sp,
               src1.bit() | src2.bit() | src3.bit() | src4.bit(),
               cond);
         } else {
           stm(db_w, sp, src1.bit() | src2.bit() | src3.bit(), cond);
           str(src4, MemOperand(sp, 4, NegPreIndex), cond);
         }
       } else {
         stm(db_w, sp, src1.bit() | src2.bit(), cond);
         Push(src3, src4, cond);
       }
     } else {
       str(src1, MemOperand(sp, 4, NegPreIndex), cond);
       Push(src2, src3, src4, cond);
     }
   }
 
   // Push five registers.  Pushes leftmost register first (to highest address).
   void Push(Register src1, Register src2, Register src3, Register src4,
             Register src5, Condition cond = al) {
-    DCHECK(!AreAliased(src1, src2, src3, src4, src5));
     if (src1.code() > src2.code()) {
       if (src2.code() > src3.code()) {
         if (src3.code() > src4.code()) {
           if (src4.code() > src5.code()) {
             stm(db_w, sp,
                 src1.bit() | src2.bit() | src3.bit() | src4.bit() | src5.bit(),
                 cond);
           } else {
             stm(db_w, sp, src1.bit() | src2.bit() | src3.bit() | src4.bit(),
                 cond);
@@ skipping 1156 matching lines @@
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_