LTO: Also include dso-local bit for calls in ThinLTO cache key.

[tejohnson]

LGTM

llvm/trunk/lib/LTO/LTO.cpp

if (auto *FS = dyn_cast<FunctionSummary>(GS)) {
       for (auto &TT : FS->type_test_assume_vcalls())
         UsedTypeIds.insert(TT.GUID);
       for (auto &TT : FS->type_checked_load_vcalls())
         UsedTypeIds.insert(TT.GUID);
       for (auto &TT : FS->type_test_assume_const_vcalls())
         UsedTypeIds.insert(TT.VFunc.GUID);
       for (auto &TT : FS->type_checked_load_const_vcalls())
         UsedTypeIds.insert(TT.VFunc.GUID);
-      for (auto &ET : FS->calls())
+      for (auto &ET : FS->calls()) {
+        AddUnsigned(ET.first.isDSOLocal());
         AddUsedCfiGlobal(ET.first.getGUID());
       }
+    }
   };
 
   // Include the hash for the linkage type to reflect internalization and weak
   // resolution, and collect any used type identifier resolutions.
   for (auto &GS : DefinedGlobals) {
     GlobalValue::LinkageTypes Linkage = GS.second->linkage();
     Hasher.update(
         ArrayRef<uint8_t>((const uint8_t *)&Linkage, sizeof(Linkage)));

llvm/trunk/test/LTO/Resolution/X86/cache-dso-local2.ll

+; Tests whether the cache is sensitive to the dso-local bit on called
+; functions.
+; RUN: rm -rf %t.cache
+; RUN: opt -module-hash -module-summary -o %t.bc %s
+; RUN: llvm-lto2 run -o %t.o %t.bc -cache-dir %t.cache \
+; RUN:   -r %t.bc,foo,px \
+; RUN:   -r %t.bc,bar,px
+; RUN: llvm-lto2 run -o %t.o %t.bc -cache-dir %t.cache \
+; RUN:   -r %t.bc,foo,plx \
+; RUN:   -r %t.bc,bar,px
+; RUN: ls %t.cache | count 2
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define weak void @foo() {
+  ret void
+}
+
+define weak void @bar() {
+  call void @foo()
+  ret void
+}