[committed] RISC-V: Fix detection of zifencei support for binutils

[Kito Cheng]

- binutils will complain version info is not found if default ISA spec
  is 2.2 for binutils.

Error: cannot find default versions of the ISA extension `zifencei'

gcc/ChangeLog:

        * configure.ac: Fix detection for zifencei support.
        * configure: Regenerate.
---
 gcc/configure    | 2 +-
 gcc/configure.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/configure b/gcc/configure
index bd4d4721868..258b17a226e 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -28746,7 +28746,7 @@ else
   gcc_cv_as_riscv_march_zifencei=no
   if test x$gcc_cv_as != x; then
     $as_echo '' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -march=rv32i_zifencei -o 
conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -march=rv32i_zifencei2p0 -o 
conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 1171c946e6e..06750cee977 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -5286,7 +5286,7 @@ configured with --enable-newlib-nano-formatted-io.])
                 [Define if the assembler understands -misa-spec=.])])
     gcc_GAS_CHECK_FEATURE([-march=rv32i_zifencei support],
       gcc_cv_as_riscv_march_zifencei,
-      [-march=rv32i_zifencei],,,
+      [-march=rv32i_zifencei2p0],,,
       [AC_DEFINE(HAVE_AS_MARCH_ZIFENCEI, 1,
                 [Define if the assembler understands -march=rv*_zifencei.])])
     ;;
-- 
2.34.0