[glibc/google/grte/v5-2.27/master] Use libc_hidden_* for atoi (bug 15105).

[Fangrui Song]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2989090595945361a67de72545d43fee9c61eb15

commit 2989090595945361a67de72545d43fee9c61eb15
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Feb 26 18:17:47 2018 +0000

    Use libc_hidden_* for atoi (bug 15105).
    
    Continuing the fixes for localplt test failures with -Os arising from
    functions not being inlined in that case, this patch fixes such
    failures for atoi by using libc_hidden_proto and libc_hidden_def.
    
    Tested for x86_64 (both that it removes this particular localplt
    failure for -Os, and that the testsuite continues to pass without
    -Os).
    
            [BZ #15105]
            * stdlib/atoi.c (atoi): Use libc_hidden_def.
            * include/stdlib.h [!_ISOMAC] (atoi): Use libc_hidden_proto.
    
    (cherry picked from commit 20602c72fa54bc0923314820ec8148186096bf3b)

Diff:
---
 include/stdlib.h | 2 ++
 stdlib/atoi.c    | 1 +
 2 files changed, 3 insertions(+)

diff --git a/include/stdlib.h b/include/stdlib.h
index 5974fb3d24..114e12d255 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -210,6 +210,8 @@ libc_hidden_proto (strtoll)
 libc_hidden_proto (strtoul)
 libc_hidden_proto (strtoull)
 
+libc_hidden_proto (atoi)
+
 extern float __strtof_nan (const char *, char **, char);
 extern double __strtod_nan (const char *, char **, char);
 extern long double __strtold_nan (const char *, char **, char);
diff --git a/stdlib/atoi.c b/stdlib/atoi.c
index a6c3f1d547..c42858494f 100644
--- a/stdlib/atoi.c
+++ b/stdlib/atoi.c
@@ -26,3 +26,4 @@ atoi (const char *nptr)
 {
   return (int) strtol (nptr, (char **) NULL, 10);
 }
+libc_hidden_def (atoi)