Another case that shouldn't have sign extends: functions returning short

are known to return properly sign extended values, no need for an explicit
extension.

llvm-svn: 23197

test/Regression/CodeGen/PowerPC/small-arguments.ll

@@ -10,3 +10,17 @@ int %test2(ushort %X) {
 	%Z = and int %Y, 65535      ;; dead
 	ret int %Z
 }
+
+void %test3() {
+	%tmp.0 = call short %foo()            ;; no extsh!
+	%tmp.1 = setlt short %tmp.0, 1234
+	br bool %tmp.1, label %then, label %UnifiedReturnBlock
+
+then:	
+	call int %test1(short 0)
+	ret void
+UnifiedReturnBlock:
+	ret void
+}
+
+declare short %foo()