[clang] [clang-format] NEVER allow && to be an unary operator. (PR #78852)

cpplearner wrote: Unary `&&` is a GCC extension to get the address of a label. See https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html Does this PR change the formatting of reasonable code that uses unary `&&`, e.g. `void *ptr; /* … */ ptr = &&foo;` in a function body? https://github.com

[clang] [clang][Sema] Don't emit 'declared here' note for builtin functions with no decl in source (PR #93394)

@@ -5,7 +5,6 @@ void similar() { // expected-note {{'similar' declared here}} if constexpr (similer<>) {} // expected-error {{use of undeclared identifier 'similer'; did you mean 'similar'?}} } void a() { if constexpr (__adl_swap<>) {}} // expected-error{{use of undeclared