[PATCH 2/2] configure: Check -falign-jumps=1 -falign-functions=1 beside -falign-loops=1

[Fangrui Song]

Clang does not support -falign-jumps and only recently gained support
for -falign-loops. Test all the alignment options to avoid passing
unrecognized options to Clang:

    clang-14: error: optimization flag '-falign-jumps=1' is not supported 
[-Werror,-Wignored-optimization-argument]

When compiled with older Clang, the alignment options are not added, so
just avoid the complexity for each option.

Signed-off-by: Fangrui Song <maskray@google.com>
---
 configure.ac | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 9a12151bd..8625e6776 100644
--- a/configure.ac
+++ b/configure.ac
@@ -798,8 +798,9 @@ fi
 
 # Force no alignment to save space on i386.
 if test "x$target_cpu" = xi386; then
-  AC_CACHE_CHECK([whether -falign-loops works], [grub_cv_cc_falign_loop], [
-    CFLAGS="$TARGET_CFLAGS -falign-loops=1 -Werror"
+  AC_CACHE_CHECK([whether -falign-jumps=1 -falign-loops=1 -falign-functions=1 
works],
+    [grub_cv_cc_falign_loop], [
+    CFLAGS="$TARGET_CFLAGS -falign-jumps=1 -falign-loops=1 -falign-functions=1 
-Werror"
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
         [grub_cv_cc_falign_loop=yes],
        [grub_cv_cc_falign_loop=no])
-- 
2.33.0.rc2.250.ged5fa647cd-goog