[turbofan] Re-enables the jump table emission in the mips instruction selector.

src/compiler/mips64/instruction-selector-mips64.cc

Index: src/compiler/mips64/instruction-selector-mips64.cc
diff --git a/src/compiler/mips64/instruction-selector-mips64.cc b/src/compiler/mips64/instruction-selector-mips64.cc
index eae2d3170d4335a6e8feb8007335be5ae5a6aac6..56188f1817ecf5c2771a3e9d49f849de76620c87 100644
--- a/src/compiler/mips64/instruction-selector-mips64.cc
+++ b/src/compiler/mips64/instruction-selector-mips64.cc
@@ -1711,27 +1711,23 @@ void InstructionSelector::VisitSwitch(Node* node, const SwitchInfo& sw) {
   Mips64OperandGenerator g(this);
   InstructionOperand value_operand = g.UseRegister(node->InputAt(0));
 
-  // TODO(mips): TableSwitch is broken, as it messes with ra without saving it
-  // properly (which breaks with frame elision, i.e. inside stubs).
-  if (false) {
-    // Emit either ArchTableSwitch or ArchLookupSwitch.
-    size_t table_space_cost = 10 + 2 * sw.value_range;
-    size_t table_time_cost = 3;
-    size_t lookup_space_cost = 2 + 2 * sw.case_count;
-    size_t lookup_time_cost = sw.case_count;
-    if (sw.case_count > 0 &&
-        table_space_cost + 3 * table_time_cost <=
-            lookup_space_cost + 3 * lookup_time_cost &&
-        sw.min_value > std::numeric_limits<int32_t>::min()) {
-      InstructionOperand index_operand = value_operand;
-      if (sw.min_value) {
-        index_operand = g.TempRegister();
-        Emit(kMips64Sub, index_operand, value_operand,
-             g.TempImmediate(sw.min_value));
-      }
-      // Generate a table lookup.
-      return EmitTableSwitch(sw, index_operand);
+  // Emit either ArchTableSwitch or ArchLookupSwitch.
+  size_t table_space_cost = 10 + 2 * sw.value_range;
+  size_t table_time_cost = 3;
+  size_t lookup_space_cost = 2 + 2 * sw.case_count;
+  size_t lookup_time_cost = sw.case_count;
+  if (sw.case_count > 0 &&
+      table_space_cost + 3 * table_time_cost <=
+          lookup_space_cost + 3 * lookup_time_cost &&
+      sw.min_value > std::numeric_limits<int32_t>::min()) {
+    InstructionOperand index_operand = value_operand;
+    if (sw.min_value) {
+      index_operand = g.TempRegister();
+      Emit(kMips64Sub, index_operand, value_operand,
+           g.TempImmediate(sw.min_value));
     }
+    // Generate a table lookup.
+    return EmitTableSwitch(sw, index_operand);
   }
 
   // Generate a sequence of conditional jumps.