Replace our home-grown BitCast with bit_cast from Chrome/Google3.

src/compiler/common-node-cache.h

Index: src/compiler/common-node-cache.h
diff --git a/src/compiler/common-node-cache.h b/src/compiler/common-node-cache.h
index 95241bc085f1bfc6b2dc877551673b500b286457..1ed2b0497dbc1b06830ee43aa0c7ba22a64e67d6 100644
--- a/src/compiler/common-node-cache.h
+++ b/src/compiler/common-node-cache.h
@@ -23,7 +23,7 @@ class CommonNodeCache FINAL : public ZoneObject {
 
   Node** FindFloat64Constant(double value) {
     // We canonicalize double constants at the bit representation level.
-    return float64_constants_.Find(zone_, BitCast<int64_t>(value));
+    return float64_constants_.Find(zone_, bit_cast<int64_t>(value));
   }
 
   Node** FindExternalConstant(ExternalReference reference) {
@@ -32,7 +32,7 @@ class CommonNodeCache FINAL : public ZoneObject {
 
   Node** FindNumberConstant(double value) {
     // We canonicalize double constants at the bit representation level.
-    return number_constants_.Find(zone_, BitCast<int64_t>(value));
+    return number_constants_.Find(zone_, bit_cast<int64_t>(value));
   }
 
   Zone* zone() const { return zone_; }