[clang-tidy] fix PR39167, bugprone-exception-escape hangs-up

Summary:
The check bugprone-exception-escape should not register
if -fno-exceptions is set for the compile options. Bailing out on non-cplusplus
and non-exceptions language options resolves the issue.

Reviewers: alexfh, aaron.ballman, baloghadamsoftware

Reviewed By: alexfh

Subscribers: lebedev.ri, xazax.hun, rnkovacs, cfe-commits

Differential Revision: https://reviews.llvm.org/D52880

llvm-svn: 343789

clang-tools-extra/clang-tidy/bugprone/ExceptionEscapeCheck.cpp

@@ -186,6 +186,9 @@ void ExceptionEscapeCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
 }
 
 void ExceptionEscapeCheck::registerMatchers(MatchFinder *Finder) {
+  if (!getLangOpts().CPlusPlus || !getLangOpts().CXXExceptions)
+    return;
+
   Finder->addMatcher(
       functionDecl(allOf(throws(unless(isIgnored(IgnoredExceptions))),
                          anyOf(isNoThrow(), cxxDestructorDecl(),