Now that C++17 is official (https://www.iso.org/standard/68564.html), start changing the C++1z terminology over to C++17. NFC intended, these are all mechanical changes.

llvm-svn: 319688
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index c16882a..9fb2bf6 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -2613,7 +2613,7 @@
 bool ASTContext::hasSameFunctionTypeIgnoringExceptionSpec(QualType T,
                                                           QualType U) {
   return hasSameType(T, U) ||
-         (getLangOpts().CPlusPlus1z &&
+         (getLangOpts().CPlusPlus17 &&
           hasSameType(getFunctionTypeWithExceptionSpec(*this, T, EST_None),
                       getFunctionTypeWithExceptionSpec(*this, U, EST_None)));
 }
@@ -3477,7 +3477,7 @@
     Unique = true;
   }
 
-  bool NoexceptInType = getLangOpts().CPlusPlus1z;
+  bool NoexceptInType = getLangOpts().CPlusPlus17;
   bool IsCanonicalExceptionSpec =
       isCanonicalExceptionSpecification(EPI.ExceptionSpec, NoexceptInType);