[clang] [llvm] [clang][ssaf] Add the TUSummaryExtractorRegistry (PR #173290)

[Balázs Benics via cfe-commits]

================
@@ -14,128 +14,131 @@
 #define LLVM_SUPPORT_REGISTRY_H
----------------
steakhal wrote:

Addressing this in https://github.com/llvm/llvm-project/pull/173295

https://github.com/llvm/llvm-project/pull/173290