Merge from mainline.

Check if llvm-gcc is available before running tests. Patch by Matthijs Kooijman!

llvm-svn: 51413

Author: tlattner

llvm/test/LLVMC/dg.exp

@@ -1,3 +1,10 @@
 load_lib llvm.exp
 
-RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{c,cpp}]]
+if [ llvm_gcc_supports c ] then {
+  RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{c}]]
+}
+
+if [ llvm_gcc_supports c++ ] then {
+  RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{cpp}]]
+}
+