Misc typos fixes in ./lib folder

Summary: Found via `codespell -q 3 -I ../clang-whitelist.txt -L uint,importd,crasher,gonna,cant,ue,ons,orign,ned`

Reviewers: teemperor

Reviewed By: teemperor

Subscribers: teemperor, jholewinski, jvesely, nhaehnle, whisperity, jfb, cfe-commits

Differential Revision: https://reviews.llvm.org/D55475

llvm-svn: 348755
diff --git a/clang/lib/StaticAnalyzer/Checkers/UninitializedObject/UninitializedPointee.cpp b/clang/lib/StaticAnalyzer/Checkers/UninitializedObject/UninitializedPointee.cpp
index 23e1b20..ae53f00 100644
--- a/clang/lib/StaticAnalyzer/Checkers/UninitializedObject/UninitializedPointee.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/UninitializedObject/UninitializedPointee.cpp
@@ -144,7 +144,7 @@
 
   assert((isDereferencableType(FR->getDecl()->getType()) ||
           V.getAs<nonloc::LocAsInteger>()) &&
-         "This method only checks dereferencable objects!");
+         "This method only checks dereferenceable objects!");
 
   if (V.isUnknown() || V.getAs<loc::ConcreteInt>()) {
     IsAnyFieldInitialized = true;