PPC/s390: [turbofan] Change Float64Max/Float64Min to JavaScript semantics.

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

Index: src/compiler/ppc/instruction-selector-ppc.cc
diff --git a/src/compiler/ppc/instruction-selector-ppc.cc b/src/compiler/ppc/instruction-selector-ppc.cc
index 8fbd69c0ee57a7d587db4d4c3de128d0a948bd74..d510392edf8272c0b04142a7de06d396781b0561 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -1326,20 +1326,19 @@ void InstructionSelector::VisitFloat64Mod(Node* node) {
 }
 
 
-void InstructionSelector::VisitFloat32Max(Node* node) { UNREACHABLE(); }
-
+void InstructionSelector::VisitFloat64Max(Node* node) {
+  VisitRRR(this, kPPC_MaxDouble, node);
+}
 
-void InstructionSelector::VisitFloat64Max(Node* node) { UNREACHABLE(); }
 
 void InstructionSelector::VisitFloat64SilenceNaN(Node* node) {
   VisitRR(this, kPPC_Float64SilenceNaN, node);
 }
 
 
-void InstructionSelector::VisitFloat32Min(Node* node) { UNREACHABLE(); }
-
-
-void InstructionSelector::VisitFloat64Min(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitFloat64Min(Node* node) {
+  VisitRRR(this, kPPC_MinDouble, node);
+}
 
 
 void InstructionSelector::VisitFloat32Abs(Node* node) {