libgo/configure: remove -fno-section-anchors for AIX

This option is no longer needed. There is no crash without it since
at least gcc-9.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/260157

gcc/go/gofrontend/MERGE

@@ -1,4 +1,4 @@
-762b74a56f7ca102a5b8da1c9d0ffce592caa46b
+2563706e4ead80d6906d66ae23c8915c360583ad
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/configure

@@ -4711,10 +4711,6 @@ fi
 
 case ${host} in
   *-*-aix*)
-    # static hash tables crashes on AIX when libgo is built with O2
-    CFLAGS="$CFLAGS -fno-section-anchors"
-    GOCFLAGS="$GOCFLAGS -fno-section-anchors"
-
     # Check default architecture for FAT library creation
     if test -z "`$CC -x c -E /dev/null -g3 -o - | grep 64BIT`" ; then
         AIX_EXTRA_ARCH='64'
@@ -11501,7 +11497,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11504 "configure"
+#line 11500 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11607,7 +11603,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11610 "configure"
+#line 11606 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H

libgo/configure.ac

@@ -33,10 +33,6 @@ AC_SUBST(CFLAGS)
 
 case ${host} in
   *-*-aix*)
-    # static hash tables crashes on AIX when libgo is built with O2
-    CFLAGS="$CFLAGS -fno-section-anchors"
-    GOCFLAGS="$GOCFLAGS -fno-section-anchors"
-
     # Check default architecture for FAT library creation
     if test -z "`$CC -x c -E /dev/null -g3 -o - | grep 64BIT`" ; then
         AIX_EXTRA_ARCH='64'