Reapply "UseListOrder: Order GlobalValue uses after initializers"

This reverts commit r214249, reapplying r214242 and r214243, now that
r214270 has fixed the UB.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214271 91177308-0d34-0410-b5e6-96231b3b80d8

test/Bitcode/local-linkage-default-visibility.3.4.ll

@@ -1,4 +1,5 @@
 ; RUN: llvm-dis < %s.bc | FileCheck %s
+; RUN: llvm-uselistorder < %s.bc -preserve-bc-use-list-order -num-shuffles=5
 
 ; local-linkage-default-visibility.3.4.ll.bc was generated by passing this file
 ; to llvm-as-3.4.  The test checks that LLVM upgrades visibility of symbols

test/Bitcode/old-aliases.ll

@@ -1,4 +1,5 @@
 ; RUN: llvm-dis < %s.bc | FileCheck %s
+; RUN: llvm-uselistorder < %s.bc -preserve-bc-use-list-order -num-shuffles=5
 
 ; old-aliases.bc consist of this file assembled with an old llvm-as (3.5 trunk)
 ; from when aliases contained a ConstantExpr.

test/Bitcode/use-list-order.ll

@@ -3,6 +3,20 @@
 @a = global [4 x i1] [i1 0, i1 1, i1 0, i1 1]
 @b = alias i1* getelementptr ([4 x i1]* @a, i64 0, i64 2)
 
+; Check use-list order of constants used by globals.
+@glob1 = global i5 7
+@glob2 = global i5 7
+@glob3 = global i5 7
+
+; Check use-list order between variables and aliases.
+@target = global i3 zeroinitializer
+@alias1 = alias i3* @target
+@alias2 = alias i3* @target
+@alias3 = alias i3* @target
+@var1 = global i3* @target
+@var2 = global i3* @target
+@var3 = global i3* @target
+
 define i64 @f(i64 %f) {
 entry:
   %sum = add i64 %f, 0