avx runtime check

[Mike Stump]

This reorders the avx checks and gates on a target triplet check before 
compiling any code.

Ok?

diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 40b5414..103a28a 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -1353,8 +1353,8 @@ proc check_effective_target_sse2_runtime { } {
 # Return 1 if the target supports running AVX executables, 0 otherwise.
 
 proc check_effective_target_avx_runtime { } {
-    if { [check_effective_target_avx]
-        && [check_avx_hw_available]
+    if { [check_avx_hw_available]
+        && [check_effective_target_avx]
         && [check_avx_os_support_available] } {
        return 1
     }