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/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 5eb2f2e..4150a24 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -507,7 +507,7 @@
     }
 
     // FIXME: Adding this to every 'CallStackFrame' may have a nontrivial impact
-    // on the overall stack usage of deeply-recursing constexpr evaluataions.
+    // on the overall stack usage of deeply-recursing constexpr evaluations.
     // (We should cache this map rather than recomputing it repeatedly.)
     // But let's try this and see how it goes; we can look into caching the map
     // as a later change.
@@ -10315,7 +10315,7 @@
   case BO_Mul:
     if (Result.isComplexFloat()) {
       // This is an implementation of complex multiplication according to the
-      // constraints laid out in C11 Annex G. The implemention uses the
+      // constraints laid out in C11 Annex G. The implementation uses the
       // following naming scheme:
       //   (a + ib) * (c + id)
       ComplexValue LHS = Result;
@@ -10396,7 +10396,7 @@
   case BO_Div:
     if (Result.isComplexFloat()) {
       // This is an implementation of complex division according to the
-      // constraints laid out in C11 Annex G. The implemention uses the
+      // constraints laid out in C11 Annex G. The implementation uses the
       // following naming scheme:
       //   (a + ib) / (c + id)
       ComplexValue LHS = Result;