[turbofan] Make Float32Neg and Float64Neg mandatory operators.

src/compiler/mips/code-generator-mips.cc

Index: src/compiler/mips/code-generator-mips.cc
diff --git a/src/compiler/mips/code-generator-mips.cc b/src/compiler/mips/code-generator-mips.cc
index 9d20ffcf27d0150c151622650c84e574f608a45a..011a74313712b7fc91e3a29f582441c256be22da 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -1156,6 +1156,12 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kMipsAbsD:
       __ abs_d(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
+    case kMipsNegS:
+      __ neg_s(i.OutputSingleRegister(), i.InputSingleRegister(0));
+      break;
+    case kMipsNegD:
+      __ neg_d(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+      break;
     case kMipsSqrtD: {
       __ sqrt_d(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;