Fix constructor-related typos.

Noticed by Roman Divacky.

llvm-svn: 190311
diff --git a/clang/utils/ABITest/ABITestGen.py b/clang/utils/ABITest/ABITestGen.py
index 62925e7..4855f48 100755
--- a/clang/utils/ABITest/ABITestGen.py
+++ b/clang/utils/ABITest/ABITestGen.py
@@ -482,7 +482,7 @@
     if not opts.useRandomSeed:
         random.seed(opts.seed)
 
-    # Contruct type generator
+    # Construct type generator
     builtins = []
     if opts.useBuiltins:
         ints = []