[PATCH] x86-64: Compile gmon tests with -mfentry [BZ #33121]

[H.J. Lu]

When glibc was configured with --enable-stack-protector=all and built
with GCC 16, I got:

FAIL: gmon/tst-gmon-gprof
FAIL: gmon/tst-gmon-pie-gprof
FAIL: gmon/tst-gmon-static-gprof
FAIL: gmon/tst-gmon-static-pie-gprof

[hjl@gnu-tgl-3 build-x86_64-linux]$ cat gmon/tst-gmon-gprof.out
--- expected
+++ actual
@@ -1,3 +1,2 @@
 f1 2000
 f2 1000
-f3 1
FAIL
[hjl@gnu-tgl-3 build-x86_64-linux]$

This is because -pg doesn't work with separate shrink wrapping in GCC 16:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120881

Compile gmon tests with -mfentry to call __fentry__ before the prologue.
This fixes BZ #33121.

OK for master?

-- 
H.J.
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