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

src/compiler/arm64/instruction-selector-arm64.cc

Index: src/compiler/arm64/instruction-selector-arm64.cc
diff --git a/src/compiler/arm64/instruction-selector-arm64.cc b/src/compiler/arm64/instruction-selector-arm64.cc
index fbc7df27e3157e33347a507d9769b86245865c5a..c24cecf4605dc68b091358c0d217e5720604936a 100644
--- a/src/compiler/arm64/instruction-selector-arm64.cc
+++ b/src/compiler/arm64/instruction-selector-arm64.cc
@@ -1276,6 +1276,26 @@ void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
 }
 
 
+void InstructionSelector::VisitBitcastFloat32ToInt32(Node* node) {
+  VisitRR(this, kArm64Float64ExtractLowWord32, node);
+}
+
+
+void InstructionSelector::VisitBitcastFloat64ToInt64(Node* node) {
+  VisitRR(this, kArm64U64MoveFloat64, node);
+}
+
+
+void InstructionSelector::VisitBitcastInt32ToFloat32(Node* node) {
+  VisitRR(this, kArm64Float64MoveU64, node);
+}
+
+
+void InstructionSelector::VisitBitcastInt64ToFloat64(Node* node) {
+  VisitRR(this, kArm64Float64MoveU64, node);
+}
+
+
 void InstructionSelector::VisitFloat32Add(Node* node) {
   VisitRRR(this, kArm64Float32Add, node);
 }