8318489: Remove unused alignment_unit and alignment_offset

Reviewed-by: thartmann

src/hotspot/share/code/codeCache.cpp

@@ -702,14 +702,6 @@ void CodeCache::metadata_do(MetadataClosure* f) {
   }
 }
 
-int CodeCache::alignment_unit() {
-  return (int)_heaps->first()->alignment_unit();
-}
-
-int CodeCache::alignment_offset() {
-  return (int)_heaps->first()->alignment_offset();
-}
-
 // Calculate the number of GCs after which an nmethod is expected to have been
 // used in order to not be classed as cold.
 void CodeCache::update_cold_gc_count() {

src/hotspot/share/code/codeCache.hpp

@@ -151,8 +151,6 @@ class CodeCache : AllStatic {
   // Allocation/administration
   static CodeBlob* allocate(int size, CodeBlobType code_blob_type, bool handle_alloc_failure = true, CodeBlobType orig_code_blob_type = CodeBlobType::All); // allocates a new CodeBlob
   static void commit(CodeBlob* cb);                        // called when the allocated CodeBlob has been filled
-  static int  alignment_unit();                            // guaranteed alignment of all CodeBlobs
-  static int  alignment_offset();                          // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
   static void free(CodeBlob* cb);                          // frees a CodeBlob
   static void free_unused_tail(CodeBlob* cb, size_t used); // frees the unused tail of a CodeBlob (only used by TemplateInterpreter::initialize())
   static bool contains(void *p);                           // returns whether p is included

src/hotspot/share/memory/heap.cpp

@@ -488,18 +488,6 @@ CodeBlob* CodeHeap::find_blob(void* start) const {
   return (result != nullptr && result->blob_contains((address)start)) ? result : nullptr;
 }
 
-size_t CodeHeap::alignment_unit() const {
-  // this will be a power of two
-  return _segment_size;
-}
-
-
-size_t CodeHeap::alignment_offset() const {
-  // The lowest address in any allocated block will be
-  // equal to alignment_offset (mod alignment_unit).
-  return sizeof(HeapBlock) & (_segment_size - 1);
-}
-
 // Returns the current block if available and used.
 // If not, it returns the subsequent block (if available), null otherwise.
 // Free blocks are merged, therefore there is at most one free block

src/hotspot/share/memory/heap.hpp

@@ -174,8 +174,6 @@ class CodeHeap : public CHeapObj<mtCode> {
 
   void* find_start(void* p)     const;   // returns the block containing p or null
   CodeBlob* find_blob(void* start) const;
-  size_t alignment_unit()       const;           // alignment of any block
-  size_t alignment_offset()     const;           // offset of first byte of any block, within the enclosing alignment unit
   static size_t header_size()         { return sizeof(HeapBlock); } // returns the header size for each heap block
 
   size_t segment_size()         const { return _segment_size; }  // for CodeHeapState