The recent refactoring from JDK-8240363 broke the build on AArch64.

Compiler error:

src/hotspot/share/opto/constantTable.cpp: In member function 'void ConstantTable::emit(CodeBuffer&)':
src/hotspot/share/opto/constantTable.cpp:117:23: error: variable 'MacroAssembler _masm' has initializer but incomplete type
   MacroAssembler _masm(&cb);
                       ^
src/hotspot/share/opto/constantTable.cpp: In member function 'void ConstantTable::fill_jump_table(CodeBuffer&, MachConstantNode*, GrowableArray<Label*>) const':
src/hotspot/share/opto/constantTable.cpp:237:23: error: variable 'MacroAssembler _masm' has initializer but incomplete type
   MacroAssembler _masm(&cb);