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

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

Index: src/compiler/mips/instruction-selector-mips.cc
diff --git a/src/compiler/mips/instruction-selector-mips.cc b/src/compiler/mips/instruction-selector-mips.cc
index 8f2f6b212892d302eaa9bffd65a93d2877fd20e1..3c4b378553e69a9e66060fcff69dfaafb2971062 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -402,6 +402,19 @@ void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
 }
 
 
+void InstructionSelector::VisitBitcastFloat32ToInt32(Node* node) {
+  VisitRR(this, kMipsFloat64ExtractLowWord32, node);
+}
+
+
+void InstructionSelector::VisitBitcastInt32ToFloat32(Node* node) {
+  MipsOperandGenerator g(this);
+  Emit(kMipsFloat64InsertLowWord32, g.DefineAsRegister(node),
+       ImmediateOperand(ImmediateOperand::INLINE, 0),
+       g.UseRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitFloat32Add(Node* node) {
   VisitRRR(this, kMipsAddS, node);
 }