add support for weak linkage


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32222 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/ARM/weak.ll b/test/CodeGen/ARM/weak.ll
new file mode 100644
index 0000000..682da8c
--- /dev/null
+++ b/test/CodeGen/ARM/weak.ll
@@ -0,0 +1,9 @@
+; RUN: llvm-upgrade < %s | llvm-as | llc -march=arm &&
+; RUN: llvm-upgrade < %s | llvm-as | llc -march=arm | grep .weak
+
+implementation   ; Functions:
+
+weak uint %f() {
+entry:
+	unreachable
+}