move register-related code to separate files, move DWARF module & handle

to pst_context, move get_frame() from pst_handler to pst_function

framework/dwarf_operations.h

@@ -129,11 +129,5 @@ typedef struct __dwarf_op_map {
 	dwarf_operation operation;	// function which handles operation
 } dwarf_op_map;
 
-typedef struct __dwarf_reg_map {
-	int				regno;		// platform-dependent register number
-	const char*		regname;	// register name
-	uint32_t		op_num;	    // number of DWARF DW_OP_reg(x)/DW_OP_breg(x) operation corresponds to this register
-} dwarf_reg_map;
-
 const dwarf_op_map* find_op_map(int op);
 int find_regnum(uint32_t op);