[stubs] Refactor StringCompareStub and use it for HStringCompareAndBranch.

src/interface-descriptors.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CALL_INTERFACE_DESCRIPTOR_H_
 #define V8_CALL_INTERFACE_DESCRIPTOR_H_
 
 #include "src/assembler.h"
 #include "src/macro-assembler.h"
 
@@ skipping 34 matching lines @@
   V(ArrayConstructorConstantArgCount)         \
   V(ArrayConstructor)                         \
   V(InternalArrayConstructorConstantArgCount) \
   V(InternalArrayConstructor)                 \
   V(Compare)                                  \
   V(CompareNil)                               \
   V(ToBoolean)                                \
   V(BinaryOp)                                 \
   V(BinaryOpWithAllocationSite)               \
   V(StringAdd)                                \
+  V(StringCompare)                            \
   V(Keyed)                                    \
   V(Named)                                    \
   V(CallHandler)                              \
   V(ArgumentAdaptor)                          \
   V(ApiFunction)                              \
   V(ApiAccessor)                              \
   V(ApiGetter)                                \
   V(ArgumentsAccessRead)                      \
   V(StoreArrayLiteralElement)                 \
   V(LoadGlobalViaContext)                     \
@@ skipping 498 matching lines @@
                      CallInterfaceDescriptor)
 };
 
 
 class StringAddDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(StringAddDescriptor, CallInterfaceDescriptor)
 };
 
 
+class StringCompareDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(StringCompareDescriptor, CallInterfaceDescriptor)
+
+  enum ParameterIndices { kLeftIndex, kRightIndex, kParameterCount };
+  static const Register LeftRegister();
+  static const Register RightRegister();
+};
+
+
 class KeyedDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(KeyedDescriptor, CallInterfaceDescriptor)
 };
 
 
 class NamedDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(NamedDescriptor, CallInterfaceDescriptor)
 };
@@ skipping 118 matching lines @@
 }  // namespace v8::internal
 
 
 #if V8_TARGET_ARCH_ARM64
 #include "src/arm64/interface-descriptors-arm64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "src/arm/interface-descriptors-arm.h"
 #endif
 
 #endif  // V8_CALL_INTERFACE_DESCRIPTOR_H_