X87: [turbofan] Add support for reinterpreting integers as floating point and vice versa.

src/compiler/x87/instruction-selector-x87.cc

Index: src/compiler/x87/instruction-selector-x87.cc
diff --git a/src/compiler/x87/instruction-selector-x87.cc b/src/compiler/x87/instruction-selector-x87.cc
index 2051b147bb099fee90f57d33e871fefcf74f0c72..ac868fb932b71adbcb60bf514db72c4f3b39bc18 100644
--- a/src/compiler/x87/instruction-selector-x87.cc
+++ b/src/compiler/x87/instruction-selector-x87.cc
@@ -665,12 +665,15 @@ void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
 
 
 void InstructionSelector::VisitBitcastFloat32ToInt32(Node* node) {
-  UNIMPLEMENTED();
+  X87OperandGenerator g(this);
+  Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(0)));
+  Emit(kX87BitcastFI, g.DefineAsRegister(node), 0, NULL);
 }
 
 
 void InstructionSelector::VisitBitcastInt32ToFloat32(Node* node) {
-  UNIMPLEMENTED();
+  X87OperandGenerator g(this);
+  Emit(kX87BitcastIF, g.DefineAsFixed(node, stX_0), g.Use(node->InputAt(0)));
 }