Add llvm_supports_darwin_and_target to DejaGNU as well, I'd almost forgotten it

ever existed. :)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95230 91177308-0d34-0410-b5e6-96231b3b80d8

test/lib/llvm.exp

@@ -301,6 +301,16 @@ proc llvm_supports_target { tgtName } {
   return 0
 }
 
+proc llvm_supports_darwin_and_target { tgtName } {
+  global target_triplet
+  if { [ llvm_supports_target $tgtName ] } {
+    if { [regexp darwin $target_triplet match] } {
+      return 1
+    }
+  }
+  return 0
+}
+
 # This procedure provides an interface to check the BINDINGS_TO_BUILD makefile
 # variable to see if a particular binding has been configured to build.
 proc llvm_supports_binding { name } {