[llvm] [SLP][NFC] Replace std::initializer_list SupportedOp with a C array (PR #203707)

[Alexey Bataev via llvm-commits]

https://github.com/alexey-bataev created https://github.com/llvm/llvm-project/pull/203707

Fixes a static_assert constant-expression build failure on older clang
(temporary initializer_list backing array).
Fixes #203184


>From 2b99235352844b81320e37e8e8fac22b7e445c8a Mon Sep 17 00:00:00 2001
From: Alexey Bataev <a.bataev at outlook.com>
Date: Sat, 13 Jun 2026 08:05:41 -0700
Subject: [PATCH] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20initia?=
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Created using spr 1.3.7
---
 llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 3d5b0ebb99f4a..5e58d0eb0fa26 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -1031,7 +1031,7 @@ namespace {
 class BinOpSameOpcodeHelper {
   using MaskType = std::uint_fast32_t;
   /// Sort SupportedOp because it is used by binary_search.
-  constexpr static std::initializer_list<unsigned> SupportedOp = {
+  constexpr static unsigned SupportedOp[] = {
       Instruction::Add,  Instruction::Sub, Instruction::Mul, Instruction::Shl,
       Instruction::AShr, Instruction::And, Instruction::Or,  Instruction::Xor};
   static_assert(llvm::is_sorted_constexpr(SupportedOp) &&