MIPS: Remove ASSERT since there are tons of different ASSIGN variants

Port r22382 (84a841f)

BUG=
R=akos.palfi@imgtec.com

Review URL: https://codereview.chromium.org/395503002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22386 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/full-codegen-mips.cc

@@ -2496,8 +2496,6 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op) {
 
   } else if (!var->is_const_mode() || op == Token::INIT_CONST) {
     if (var->IsLookupSlot()) {
-      ASSERT(op == Token::ASSIGN || op == Token::INIT_VAR ||
-             op == Token::ASSIGN_ADD);
       // Assignment to var.
       __ li(a1, Operand(var->name()));
       __ li(a0, Operand(Smi::FromInt(strict_mode())));

src/mips64/full-codegen-mips64.cc

@@ -2490,8 +2490,6 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op) {
 
   } else if (!var->is_const_mode() || op == Token::INIT_CONST) {
     if (var->IsLookupSlot()) {
-      ASSERT(op == Token::ASSIGN || op == Token::INIT_VAR ||
-             op == Token::ASSIGN_ADD);
       // Assignment to var.
       __ li(a4, Operand(var->name()));
       __ li(a3, Operand(Smi::FromInt(strict_mode())));