re PR rtl-optimization/6627 (-fno-align-functions regression from 2.95)

re PR rtl-optimization/6627 (-fno-align-functions regression from 2.95)

	PR optimization/6627
	* toplev.c (force_align_functions_log): New global variable.
	* flags.h (force_align_functions_log): Add extern prototype.
	* varasm.c (assemble_start_function): Use it to force minimum
	function alignment.
	* config/i386/i386.h (FUNCTION_BOUNDARY): Set the correct
	minimum function alignment to one byte.
	(TARGET_PTRMEMFUNC_VBIT_LOCATION): Store the virtual bit in
	the least significant bit of vtable member function pointers.
	* tree.h (enum ptrmemfunc_vbit_where_t): Move definition to
	here from cp/cp-tree.h.

	* cp/cp-tree.h (enum ptrmemfunc_vbit_where_t): Delete definition
	from here, and move it to tree.h.
	* cp/decl.c (cxx_init_decl_processing): If storing the vbit
	in function pointers, ensure that force_align_functions_log
	is atleast one.

	* java/lang.c (java_init): If storing the vbit in function
	pointers, ensure that force_align_functions_log is atleast
	one to aid compatability with g++ vtables.

From-SVN: r57745