Another testcase for constness linkage

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16691 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Linker/ConstantGlobals3.ll b/test/Linker/ConstantGlobals3.ll
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+++ b/test/Linker/ConstantGlobals3.ll
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+; Test that appending linkage works correctly when arrays are the same size.
+
+; RUN: echo "%X = uninitialized constant [1x int]" | llvm-as > %t.2.bc
+; RUN: llvm-as < %s > %t.1.bc
+; RUN: llvm-link %t.[12].bc | llvm-dis | grep constant
+
+%X = uninitialized global [1 x int]