Fix the merging of the constantness of declarations.

The langref says:

LLVM explicitly allows declarations of global variables to be marked
constant, even if the final definition of the global is not. This
capability can be used to enable slightly better optimization of the
program, but requires the language definition to guarantee that
optimizations based on the ‘constantness’ are valid for the
translation units that do not include the definition.

Given that definition, when merging two declarations, we have to drop
constantness if of of them is not marked contant, since the Module
without the constant marker might not have the necessary guarantees.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220927 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Linker/LinkModules.cpp

@@ -1052,9 +1052,8 @@ bool ModuleLinker::linkGlobalProto(GlobalVariable *SGV) {
         if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) {
           DGVar->setAlignment(Alignment);
 
-          if (DGVar->isDeclaration() && SGV->isConstant() &&
-              !DGVar->isConstant())
-            DGVar->setConstant(true);
+          if (DGVar->isDeclaration() && !SGV->isConstant())
+            DGVar->setConstant(false);
         }
 
         // Set calculated linkage, visibility and unnamed_addr.

test/Linker/ConstantGlobals3.ll

@@ -1,6 +1,6 @@
 ; RUN: llvm-link %s %S/Inputs/ConstantGlobals3.ll -S | FileCheck %s
 ; RUN: llvm-link %S/Inputs/ConstantGlobals3.ll %s -S | FileCheck %s
 
-; CHECK: @X = external constant [1 x i32]
+; CHECK: @X = external global [1 x i32]
 
 @X = external global [1 x i32]