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

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index 9faf5ebcd87e97d075f61b369157c011eb08beaf..792d1d5a47e044bdcba913d094e0b429001c2516 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -687,6 +687,18 @@ void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
 }
 
 
+void InstructionSelector::VisitBitcastFloat32ToInt32(Node* node) {
+  IA32OperandGenerator g(this);
+  Emit(kIA32BitcastFI, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+}
+
+
+void InstructionSelector::VisitBitcastInt32ToFloat32(Node* node) {
+  IA32OperandGenerator g(this);
+  Emit(kIA32BitcastIF, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitFloat32Add(Node* node) {
   VisitRROFloat(this, node, kAVXFloat32Add, kSSEFloat32Add);
 }