Remove redundant calls to isMaterializable.

This removes calls to isMaterializable in the following cases:

* It was redundant with a call to isDeclaration now that isDeclaration returns
  the correct answer for materializable functions.
* It was followed by a call to Materialize. Just call Materialize and check EC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221050 91177308-0d34-0410-b5e6-96231b3b80d8

lib/IR/Verifier.cpp

@@ -377,8 +377,8 @@ void Verifier::visit(Instruction &I) {
 
 
 void Verifier::visitGlobalValue(const GlobalValue &GV) {
-  Assert1(!GV.isDeclaration() || GV.isMaterializable() ||
-              GV.hasExternalLinkage() || GV.hasExternalWeakLinkage(),
+  Assert1(!GV.isDeclaration() || GV.hasExternalLinkage() ||
+              GV.hasExternalWeakLinkage(),
           "Global is external, but doesn't have external or weak linkage!",
           &GV);