LoongArch: Fix build error for LTO with LLVM-18

Commit b1521282 ("LoongArch: Make LTO case independent in Makefile")
moves "KBUILD_LDFLAGS += -mllvm --loongarch-annotate-tablejump" out of
CONFIG_CC_HAS_ANNOTATE_TABLEJUMP, which breaks the build for LLVM-18, as
'--loongarch-annotate-tablejump' is unimplemented there:

ld.lld: error: -mllvm: ld.lld: Unknown command line argument '--loongarch-annotate-tablejump'.

Call ld-option to detect '--loongarch-annotate-tablejump' before use, so
as to fix the build error.

Fixes: b1521282 ("LoongArch: Make LTO case independent in Makefile")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org> # build
Suggested-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>