Handle init statements in readability-else-after-return

Adds a new ASTMatcher condition called 'hasInitStatement()' that matches if,
switch and range-for statements with an initializer. Reworked clang-tidy
readability-else-after-return to handle variables in the if condition or init
statements in c++17 ifs. Also checks if removing the else would affect object
lifetimes in the else branch.

Fixes PR44364.

1 files changed, 1 insertions, 0 deletions

diff --git a/clang/lib/ASTMatchers/Dynamic/Registry.cpp b/clang/lib/ASTMatchers/Dynamic/Registry.cpp
index 8c11e069cb0..89722489fe2 100644
--- a/clang/lib/ASTMatchers/Dynamic/Registry.cpp
+++ b/clang/lib/ASTMatchers/Dynamic/Registry.cpp
@@ -279,6 +279,7 @@ RegistryMaps::RegistryMaps() {
   REGISTER_MATCHER(hasIndex);
   REGISTER_MATCHER(hasInit);
   REGISTER_MATCHER(hasInitializer);
+  REGISTER_MATCHER(hasInitStatement);
   REGISTER_MATCHER(hasKeywordSelector);
   REGISTER_MATCHER(hasLHS);
   REGISTER_MATCHER(hasLocalQualifiers);