Replaced unary negation by multiplication with -1.

src/mips/full-codegen-mips.cc

Index: src/mips/full-codegen-mips.cc
diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc
index 3a627d7465adbeff8e7481955d2ccd07ade8f535..0a26dbe431cafd0db210a40d9d6c454d8ceea196 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -4382,10 +4382,6 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
       break;
     }
 
-    case Token::SUB:
-      EmitUnaryOperation(expr, "[ UnaryOperation (SUB)");
-      break;
-
     case Token::BIT_NOT:
       EmitUnaryOperation(expr, "[ UnaryOperation (BIT_NOT)");
       break;
@@ -4398,6 +4394,7 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
 
 void FullCodeGenerator::EmitUnaryOperation(UnaryOperation* expr,
                                            const char* comment) {
+  ASSERT_EQ(Token::BIT_NOT, expr->op());
   // TODO(svenpanne): Allowing format strings in Comment would be nice here...
   Comment cmt(masm_, comment);
   UnaryOpStub stub(expr->op());