x86: add kconfig symbols for assembler VAES and VPCLMULQDQ support

Add config symbols AS_VAES and AS_VPCLMULQDQ that expose whether the
assembler supports the vector AES and carryless multiplication
cryptographic extensions.

Reviewed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/Kconfig.assembler

@@ -25,6 +25,16 @@ config AS_GFNI
 	help
 	  Supported by binutils >= 2.30 and LLVM integrated assembler
 
+config AS_VAES
+	def_bool $(as-instr,vaesenc %ymm0$(comma)%ymm1$(comma)%ymm2)
+	help
+	  Supported by binutils >= 2.30 and LLVM integrated assembler
+
+config AS_VPCLMULQDQ
+	def_bool $(as-instr,vpclmulqdq \$0x10$(comma)%ymm0$(comma)%ymm1$(comma)%ymm2)
+	help
+	  Supported by binutils >= 2.30 and LLVM integrated assembler
+
 config AS_WRUSS
 	def_bool $(as-instr,wrussq %rax$(comma)(%rbx))
 	help