Don't ever call materializeAllPermanently during LTO.

To do this, change the representation of lazy loaded functions.

The previous representation cannot differentiate between a function whose body
has been removed and one whose body hasn't been read from the .bc file. That
means that in order to drop a function, the entire body had to be read.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220580 91177308-0d34-0410-b5e6-96231b3b80d8

lib/IR/Verifier.cpp

@@ -2632,7 +2632,7 @@ bool llvm::verifyModule(const Module &M, raw_ostream *OS) {
 
   bool Broken = false;
   for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
-    if (!I->isDeclaration())
+    if (!I->isDeclaration() && !I->isMaterializable())
       Broken |= !V.verify(*I);
 
   // Note that this function's return value is inverted from what you would