Fix the interpreter to not crash due to zeroext/signext

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86428 91177308-0d34-0410-b5e6-96231b3b80d8

test/ExecutionEngine/interpreter-ext.ll

@@ -0,0 +1,19 @@
+; RUN: lli -force-interpreter
+; Extending a value due to zeroext/signext will leave it the wrong size
+; causing problems later, such as a crash if you try to extend it again.
+
+define void @zero(i8 zeroext %foo) {
+  zext i8 %foo to i32
+  ret void
+}
+
+define void @sign(i8 signext %foo) {
+  sext i8 %foo to i32
+  ret void
+}
+
+define i32 @main() {
+  call void @zero(i8 0)
+  call void @sign(i8 0)
+  ret i32 0
+}