Update on "[CIR][IR] Refactor do-while loops"

Creates a separate C/C++ operation for do-while loops, while keeping the
LoopOpInterface to generically handle loops. This simplifies the IR
generation and printing/parsing of do-while loops. It also allows us to
define it regions in the order that they are executed, which is useful
for the lifetime analysis.

[ghstack-poisoned]

clang/include/clang/CIR/Dialect/IR/CIRDialect.h

@@ -32,8 +32,8 @@
 #include "clang/CIR/Dialect/IR/CIRTypes.h"
 
 #include "clang/CIR/Interfaces/ASTAttrInterfaces.h"
-#include "clang/CIR/Interfaces/CIROpInterfaces.h"
 #include "clang/CIR/Interfaces/CIRLoopOpInterface.h"
+#include "clang/CIR/Interfaces/CIROpInterfaces.h"
 
 namespace mlir {
 namespace OpTrait {