Check isDiscardableIfUnused, rather than hasLocalLinkage, when bumping

GlobalValue linkage up to ExternalLinkage in the ExtractGV pass. This
prevents linkonce and linkonce_odr symbols from being DCE'd.

llvm-svn: 176459

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/Transforms/IPO/ExtractGV.cpp b/llvm/lib/Transforms/IPO/ExtractGV.cpp
index 8a6bfc6..fa3d72d 100644
--- a/llvm/lib/Transforms/IPO/ExtractGV.cpp
+++ b/llvm/lib/Transforms/IPO/ExtractGV.cpp
@@ -60,7 +60,7 @@ namespace {
             continue;
         }
 
-        bool Local = I->hasLocalLinkage();
+        bool Local = I->isDiscardableIfUnused();
         if (Local)
           I->setVisibility(GlobalValue::HiddenVisibility);
 
@@ -80,7 +80,7 @@ namespace {
             continue;
         }
 
-        bool Local = I->hasLocalLinkage();
+        bool Local = I->isDiscardableIfUnused();
         if (Local)
           I->setVisibility(GlobalValue::HiddenVisibility);
 
@@ -97,7 +97,7 @@ namespace {
         Module::alias_iterator CurI = I;
         ++I;
 
-        if (CurI->hasLocalLinkage()) {
+        if (CurI->isDiscardableIfUnused()) {
           CurI->setVisibility(GlobalValue::HiddenVisibility);
           CurI->setLinkage(GlobalValue::ExternalLinkage);
         }