Move unrelocated_addr to common-types.h

unrelocated_addr is currently defined in symtab.h, but in order to
avoid having to include that in more places, I wanted to move the type
elsewhere.  I considered defs.h, but it seemed reasonable to have it
next to CORE_ADDR, which is what this patch does.

gdb/symtab.h

@@ -58,12 +58,6 @@ class probe;
 struct lookup_name_info;
 struct code_breakpoint;
 
-/* Like a CORE_ADDR, but not directly convertible.  This is used to
-   represent an unrelocated CORE_ADDR.  DEFINE_OFFSET_TYPE is not used
-   here because there's no need to add or subtract values of this
-   type.  */
-enum class unrelocated_addr : CORE_ADDR { };
-
 /* How to match a lookup name against a symbol search name.  */
 enum class symbol_name_match_type
 {

gdbsupport/common-types.h

@@ -28,6 +28,12 @@ typedef unsigned char gdb_byte;
 /* * An address in the program being debugged.  Host byte order.  */
 typedef uint64_t CORE_ADDR;
 
+/* Like a CORE_ADDR, but not directly convertible.  This is used to
+   represent an unrelocated CORE_ADDR.  DEFINE_OFFSET_TYPE is not used
+   here because there's no need to add or subtract values of this
+   type.  */
+enum class unrelocated_addr : CORE_ADDR { };
+
 /* LONGEST must be at least as big as CORE_ADDR.  */
 
 typedef int64_t LONGEST;