s390x: avoid inline assembly for vector loads for clang

... since clang does not support the instruction format for inline
assembly and also it is not required for current versions of clang.

Signed-off-by: Marius Hillenbrand <mhillen@linux.ibm.com>

kernel/zarch/gemm_vec.c

@@ -172,7 +172,7 @@ static inline vector_float vec_load_hinted(FLOAT const *restrict a) {
 	vector_float const *restrict addr = (vector_float const *restrict)a;
 	vector_float y;
 
-#if __GNUC__ < 9
+#if __GNUC__ < 9 && !defined(__clang__)
 	// hex-encode vl %[out],%[addr],3
 	asm(".insn vrx,0xe70000003006,%[out],%[addr],3"
 	    : [ out ] "=v"(y)