Arm support for DoubleToIStub (truncating).

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index c58acd6b16d4674a2b4da3f7a49d6ceca0c62cfe..4be914da6c296e5ff2b731abb8fee43598aa8a96 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -1704,11 +1704,13 @@ class DoubleToIStub : public PlatformCodeStub {
   DoubleToIStub(Register source,
                 Register destination,
                 int offset,
-                bool is_truncating) : bit_field_(0) {
+                bool is_truncating,
+                bool skip_fastpath = false) : bit_field_(0) {
     bit_field_ = SourceRegisterBits::encode(source.code_) |
       DestinationRegisterBits::encode(destination.code_) |
       OffsetBits::encode(offset) |
-      IsTruncatingBits::encode(is_truncating);
+      IsTruncatingBits::encode(is_truncating) |
+      SkipFastPathBits::encode(skip_fastpath);
   }
 
   Register source() {
@@ -1725,12 +1727,18 @@ class DoubleToIStub : public PlatformCodeStub {
     return IsTruncatingBits::decode(bit_field_);
   }
 
+  bool skip_fastpath() {
+    return SkipFastPathBits::decode(bit_field_);
+  }
+
   int offset() {
     return OffsetBits::decode(bit_field_);
   }
 
   void Generate(MacroAssembler* masm);
 
+  virtual bool SometimesSetsUpAFrame() { return false; }
+
  private:
   static const int kBitsPerRegisterNumber = 6;
   STATIC_ASSERT((1L << kBitsPerRegisterNumber) >= Register::kNumRegisters);
@@ -1743,6 +1751,8 @@ class DoubleToIStub : public PlatformCodeStub {
       public BitField<bool, 2 * kBitsPerRegisterNumber, 1> {};  // NOLINT
   class OffsetBits:
       public BitField<int, 2 * kBitsPerRegisterNumber + 1, 3> {};  // NOLINT
+  class SkipFastPathBits:
+      public BitField<int, 2 * kBitsPerRegisterNumber + 4, 1> {};  // NOLINT
 
   Major MajorKey() { return DoubleToI; }
   int MinorKey() { return bit_field_; }