6939207: refactor constant pool index processing
Summary: Factored cleanup of instruction decode which prepares for enhanced ldc semantics.
Reviewed-by: twisti
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// ciConstantPoolCache
//
// The class caches indexed constant pool lookups.
//
// Usage note: this klass has nothing to do with constantPoolCacheOop.
class ciConstantPoolCache : public ResourceObj {
private:
GrowableArray<intptr_t>* _keys;
GrowableArray<void*>* _elements;
int find(int index);
public:
ciConstantPoolCache(Arena* arena, int expected_size);
// Get the element associated with some index.
void* get(int index);
// Associate an element with an index.
void insert(int index, void* element);
void print();
};