[VP] Refactor VectorBuilder to avoid layering violation. NFC (#99276)

This patch refactors the handling of reduction to eliminate layering
violations.

* Introduced `getReductionIntrinsicID` in LoopUtils.h for mapping
recurrence kinds to llvm.vector.reduce.* intrinsic IDs.
* Updated `VectorBuilder::createSimpleTargetReduction` to accept
llvm.vector.reduce.* intrinsic directly.
* New function `VPIntrinsic::getForIntrinsic` for mapping intrinsic ID
to the same functional VP intrinsic ID.

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/lib/IR/IntrinsicInst.cpp b/llvm/lib/IR/IntrinsicInst.cpp
index 64a14da..db3b019 100644
--- a/llvm/lib/IR/IntrinsicInst.cpp
+++ b/llvm/lib/IR/IntrinsicInst.cpp
@@ -599,6 +599,25 @@ Intrinsic::ID VPIntrinsic::getForOpcode(unsigned IROPC) {
   return Intrinsic::not_intrinsic;
 }
 
+constexpr static Intrinsic::ID getForIntrinsic(Intrinsic::ID Id) {
+  if (::isVPIntrinsic(Id))
+    return Id;
+
+  switch (Id) {
+  default:
+    break;
+#define BEGIN_REGISTER_VP_INTRINSIC(VPID, ...) break;
+#define VP_PROPERTY_FUNCTIONAL_INTRINSIC(INTRIN) case Intrinsic::INTRIN:
+#define END_REGISTER_VP_INTRINSIC(VPID) return Intrinsic::VPID;
+#include "llvm/IR/VPIntrinsics.def"
+  }
+  return Intrinsic::not_intrinsic;
+}
+
+Intrinsic::ID VPIntrinsic::getForIntrinsic(Intrinsic::ID Id) {
+  return ::getForIntrinsic(Id);
+}
+
 bool VPIntrinsic::canIgnoreVectorLengthParam() const {
   using namespace PatternMatch;