[stubs,interpreter] Optimise SMI loading for 64-bit targets.

src/interpreter/interpreter-assembler.h

Index: src/interpreter/interpreter-assembler.h
diff --git a/src/interpreter/interpreter-assembler.h b/src/interpreter/interpreter-assembler.h
index e21a02c837494b21f98c693b1ac28e79e8583ddb..08ab44658ef591c66d4160d81a950fb8a7e04a67 100644
--- a/src/interpreter/interpreter-assembler.h
+++ b/src/interpreter/interpreter-assembler.h
@@ -77,6 +77,9 @@ class InterpreterAssembler : public CodeStubAssembler {
   // Load constant at |index| in the constant pool.
   compiler::Node* LoadConstantPoolEntry(compiler::Node* index);
 
+  // Load and untag constant at |index| in the constant pool.
+  compiler::Node* LoadAndUntagConstantPoolEntry(compiler::Node* index);
+
   // Load |slot_index| from |context|.
   compiler::Node* LoadContextSlot(compiler::Node* context, int slot_index);
   compiler::Node* LoadContextSlot(compiler::Node* context,