update test to use ivar in implementation instead of class extension

Summary: using ivar in class extension is not supported in 32-bit architecture of MacOS.

Reviewers: alexfh, hokein

Reviewed By: alexfh

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D45912

llvm-svn: 330559
diff --git a/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp b/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
index 95a71f6..992bdc0 100644
--- a/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
+++ b/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
@@ -109,6 +109,7 @@
     m(TemplateParameter) \
     m(TypeAlias) \
     m(MacroDefinition) \
+    m(ObjcIvar) \
 
 enum StyleKind {
 #define ENUMERATE(v) SK_ ## v,
@@ -384,6 +385,9 @@
     const NamedDecl *D,
     const std::vector<llvm::Optional<IdentifierNamingCheck::NamingStyle>>
         &NamingStyles) {
+  if (isa<ObjCIvarDecl>(D) && NamingStyles[SK_ObjcIvar])
+    return SK_ObjcIvar;
+  
   if (isa<TypedefDecl>(D) && NamingStyles[SK_Typedef])
     return SK_Typedef;