[glibc] stdlib: Remove unused is_aligned function from qsort.c

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=31bd548650673e8b5ae1a31f1c596ff8305a5d4c

commit 31bd548650673e8b5ae1a31f1c596ff8305a5d4c
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Jan 17 08:08:01 2024 -0300

    stdlib: Remove unused is_aligned function from qsort.c
    
    Checked on x86_64-linux-gnu.

Diff:
---
 stdlib/qsort.c | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/stdlib/qsort.c b/stdlib/qsort.c
index 45af8da80c..7f5a00fb33 100644
--- a/stdlib/qsort.c
+++ b/stdlib/qsort.c
@@ -40,19 +40,6 @@ enum swap_type_t
 typedef uint32_t __attribute__ ((__may_alias__)) u32_alias_t;
 typedef uint64_t __attribute__ ((__may_alias__)) u64_alias_t;
 
-/* If this function returns true, elements can be safely copied using word
-   loads and stores.  Otherwise, it might not be safe.  BASE (as an integer)
-   must be a multiple of the word alignment.  SIZE must be a multiple of
-   WORDSIZE.  Since WORDSIZE must be a multiple of the word alignment, and
-   WORDSIZE is a power of two on all supported platforms, this function for
-   speed merely checks that BASE and SIZE are both multiples of the word
-   size.  */
-static inline bool
-is_aligned (const void *base, size_t size, size_t wordsize)
-{
-  return (((uintptr_t) base | size) & (wordsize - 1)) == 0;
-}
-
 static inline void
 swap_words_64 (void * restrict a, void * restrict b, size_t n)
 {