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

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index 445c7833176796782764079024889e5ec9ab46af..4290bc91acf5921d73d2f790b837049b1e065dd0 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -316,6 +316,7 @@
 
   // 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 {
@@ -326,6 +327,7 @@
 
   // 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);
@@ -345,6 +347,7 @@
             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()) {
@@ -369,6 +372,7 @@
   // 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()) {