For PR1028:

Ensure the CBE generates calls to GCC builtins for stack_save and
stack_restore when it encounters the corresponding intrinsics.

Patch by Gordon Henriksen.

llvm-svn: 33312

llvm/test/CodeGen/CBackend/2007-01-17-StackSaveNRestore.ll

@@ -0,0 +1,12 @@
+; RUN: llvm-as < %s | llc -march=c | grep __builtin_stack_save
+; RUN: llvm-as < %s | llc -march=c | grep __builtin_stack_restore
+; PR1028
+
+declare i8* %llvm.stacksave()
+declare void %llvm.stackrestore(i8*)
+
+define i8* %test() {
+    %s = call i8* %llvm.stacksave()
+    call void %llvm.stackrestore(i8* %s)
+    ret i8* %s
+}