Expand MUX instructions early on Hexagon

This time with all files included.

llvm-svn: 233696
diff --git a/llvm/test/CodeGen/Hexagon/expand-condsets-basic.ll b/llvm/test/CodeGen/Hexagon/expand-condsets-basic.ll
new file mode 100644
index 0000000..16fe8af
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/expand-condsets-basic.ll
@@ -0,0 +1,11 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+; CHECK: if{{.*}}add
+; CHECK: if{{.*}}sub
+
+define i32 @foo (i1 %a, i32 %b, i32 %c, i32 %d) nounwind {
+  %1 = add i32 %b, %d
+  %2 = sub i32 %c, %d
+  %3 = select i1 %a, i32 %1, i32 %2
+  ret i32 %3
+}
+