Remove personality for declarations in CloneModule.

Personality is copied as part of copyFunctionAttributes, but it is
invalid on a declaration. Remove the personality attribute it the
function body is not cloned.

Also add a verifier run over output modules in the llvm-split tool.

llvm-svn: 264667
diff --git a/llvm/lib/Transforms/Utils/CloneModule.cpp b/llvm/lib/Transforms/Utils/CloneModule.cpp
index b16a02a..494e275 100644
--- a/llvm/lib/Transforms/Utils/CloneModule.cpp
+++ b/llvm/lib/Transforms/Utils/CloneModule.cpp
@@ -126,6 +126,8 @@
     if (!ShouldCloneDefinition(&*I)) {
       // Skip after setting the correct linkage for an external reference.
       F->setLinkage(GlobalValue::ExternalLinkage);
+      // Personality function is not valid on a declaration.
+      F->setPersonalityFn(nullptr);
       continue;
     }
     if (!I->isDeclaration()) {