Add a testcase for a function we cannot legally promote the argument of.

llvm-svn: 17716

llvm/test/Regression/Transforms/ArgumentPromotion/control-flow.ll

@@ -0,0 +1,18 @@
+; RUN: llvm-as < %s | opt -argpromotion | llvm-dis | not grep 'load int\* null'
+
+implementation
+
+internal int %callee(bool %C, int* %P) {
+	br bool %C, label %T, label %F
+T:
+	ret int 17
+F:
+	%X = load int* %P
+	ret int %X
+}
+
+int %foo() {
+	%X = call int %callee(bool true, int* null)
+	ret int %X
+}
+