[compiler] Fix a bunch of wrong word size assumptions.

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 9600dfb6c5fc07e840847522f5c3a1f7ed3204fa..2a1672a9114f63e7e86bb6ac6f5bfbeadfd1fdca 100644
--- a/src/interpreter/interpreter-assembler.h
+++ b/src/interpreter/interpreter-assembler.h
@@ -62,9 +62,6 @@ class InterpreterAssembler : public compiler::CodeStubAssembler {
   // Load constant at |index| in the constant pool.
   compiler::Node* LoadConstantPoolEntry(compiler::Node* index);
 
-  // Load an element from a fixed array on the heap.
-  compiler::Node* LoadFixedArrayElement(compiler::Node* fixed_array, int index);
-
   // Load a field from an object on the heap.
   compiler::Node* LoadObjectField(compiler::Node* object, int offset);