[llvm] Add llvm.looptrap intrinsic. (PR #181299)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/CodeGen/PreISelIntrinsicLowering.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/CodeGen/PreISelIntrinsicLowering.cpp b/llvm/lib/CodeGen/PreISelIntrinsicLowering.cpp
index 649f422b8..0544995f9 100644
--- a/llvm/lib/CodeGen/PreISelIntrinsicLowering.cpp
+++ b/llvm/lib/CodeGen/PreISelIntrinsicLowering.cpp
@@ -653,7 +653,7 @@ static bool expandLoopTrap(Function &Intr) {
         // "unconditional conditional branch" by combining the two basic blocks
         // if possible, or replacing it with an unconditional branch.
         if (BI->getSuccessor(0) == Call->getParent()) {
-          // The looptrap is on the true branch. 
+          // The looptrap is on the true branch.
           Cond = BI->getCondition();
           BI->setCondition(ConstantInt::getFalse(BI->getContext()));
         } else {

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https://github.com/llvm/llvm-project/pull/181299