Rebased PNaCl localmods in LLVM to 223109

test/Transforms/NaCl/globalcleanup.ll

+; RUN: opt < %s -nacl-global-cleanup -S | FileCheck %s
+; RUN: opt < %s -nacl-global-cleanup -S | FileCheck -check-prefix=GV %s
+
+@llvm.compiler.used = appending global [0 x i8*] zeroinitializer, section "llvm.metadata"
+@llvm.used = appending global [0 x i8*] zeroinitializer, section "llvm.metadata"
+
+; GV-NOT: llvm.used
+; GV-NOT: llvm.compiler.used
+
+@extern_weak_const = extern_weak constant i32
+@extern_weak_gv = extern_weak global i32
+
+; GV-NOT: @extern_weak_const
+; GV-NOT: @extern_weak_gv
+
+; CHECK: @weak_gv = internal global
+@weak_gv = weak global i32 0
+
+; CHECK: define void @_start
+define void @_start() {
+  ret void
+}
+
+define i32* @ewgv() {
+; CHECK: %bc = getelementptr i8* null, i32 0
+  %bc = getelementptr i8* bitcast (i32* @extern_weak_gv to i8*), i32 0
+; CHECK: ret i32* null
+  ret i32* @extern_weak_gv
+}
+
+define i32* @ewc() {
+; CHECK: %bc = getelementptr i8* null, i32 0
+  %bc = getelementptr i8* bitcast (i32* @extern_weak_const to i8*), i32 0
+; CHECK: ret i32* null
+  ret i32* @extern_weak_gv
+}
+
+; Make sure @weak_gv is actually used.
+define i32* @wgv() {
+; CHECK: ret i32* @weak_gv
+  ret i32* @weak_gv
+}
+
+; GV-NOT: @extern_weak_func
+declare extern_weak i32 @extern_weak_func()
+; CHECK: @ewf
+define i32 @ewf() {
+; CHECK: %ret = call i32 null()
+  %ret = call i32 @extern_weak_func()
+  ret i32 %ret
+}
+
+; CHECK: define internal void @weak_func
+define weak void @weak_func() {
+  ret void
+}