Remove frameptr-based unwinder.

The frameptr-based unwinder was an interim solution while issues with
libunwind were resolved. It's better if we remove it,
so we don't have to support it moving forward.

include/jemalloc/internal/jemalloc_internal_defs.h.in

@@ -175,9 +175,6 @@
 /* Use gcc intrinsics for profile backtracing if defined. */
 #undef JEMALLOC_PROF_GCC
 
-/* Use frame pointer for profile backtracing if defined. Linux only. */
-#undef JEMALLOC_PROF_FRAME_POINTER
-
 /* JEMALLOC_PAGEID enabled page id */
 #undef JEMALLOC_PAGEID
 

include/jemalloc/internal/jemalloc_preamble.h.in

@@ -130,13 +130,6 @@ static const bool config_prof_libunwind =
     false
 #endif
     ;
-static const bool config_prof_frameptr =
-#ifdef JEMALLOC_PROF_FRAME_POINTER
-    true
-#else
-    false
-#endif
-    ;
 static const bool maps_coalesce =
 #ifdef JEMALLOC_MAPS_COALESCE
     true

include/jemalloc/internal/malloc_io.h

@@ -89,13 +89,4 @@ malloc_close(int fd) {
 #endif
 }
 
-static inline off_t
-malloc_lseek(int fd, off_t offset, int whence) {
-#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_lseek)
-	return (off_t)syscall(SYS_lseek, fd, offset, whence);
-#else
-	return lseek(fd, offset, whence);
-#endif
-}
-
 #endif /* JEMALLOC_INTERNAL_MALLOC_IO_H */

include/jemalloc/internal/prof_sys.h

@@ -21,7 +21,6 @@ void prof_fdump_impl(tsd_t *tsd);
 void prof_idump_impl(tsd_t *tsd);
 bool prof_mdump_impl(tsd_t *tsd, const char *filename);
 void prof_gdump_impl(tsd_t *tsd);
-int  prof_thread_stack_range(uintptr_t fp, uintptr_t *low, uintptr_t *high);
 
 /* Used in unit tests. */
 typedef int(prof_sys_thread_name_read_t)(char *buf, size_t limit);