[clang] [CIR][NFC] Generate ABI lowering patterns with TableGen (PR #175021)

[Andy Kaylor via cfe-commits]

================
@@ -20,6 +20,8 @@ using namespace llvm;
 using namespace clang;
 
 namespace {
+std::vector<std::string> ABILoweringPatterns;
+std::vector<std::string> ABILoweringPatternsList;
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andykaylor wrote:

```suggestion
std::vector<std::string> CXXABILoweringPatterns;
std::vector<std::string> CXXABILoweringPatternsList;
```
As above

https://github.com/llvm/llvm-project/pull/175021