Reland [heap] Avoid the use of cells to point from code to new-space objects.

src/mips64/macro-assembler-mips64.cc

Index: src/mips64/macro-assembler-mips64.cc
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index c5ca43bae5dee8dc08d60e60bc46826487a363d3..f238c52427ee0eb9e8d0869fa1f9ac0419b37085 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -1595,19 +1595,7 @@ void MacroAssembler::Usdc1(FPURegister fd, const MemOperand& rs,
 }
 
 void MacroAssembler::li(Register dst, Handle<Object> value, LiFlags mode) {
-  AllowDeferredHandleDereference smi_check;
-  if (value->IsSmi()) {
-    li(dst, Operand(value), mode);
-  } else {
-    DCHECK(value->IsHeapObject());
-    if (isolate()->heap()->InNewSpace(*value)) {
-      Handle<Cell> cell = isolate()->factory()->NewCell(value);
-      li(dst, Operand(cell));
-      ld(dst, FieldMemOperand(dst, Cell::kValueOffset));
-    } else {
-      li(dst, Operand(value));
-    }
-  }
+  li(dst, Operand(value), mode);
 }
 
 static inline int64_t ShiftAndFixSignExtension(int64_t imm, int bitnum) {