[llvm] [SandboxIR] Implement the InsertElementInst class (PR #102404)

[Jorge Gorbe Moya via llvm-commits]

================
@@ -753,6 +755,48 @@ class SelectInst : public Instruction {
 #endif
 };
 
+class InsertElementInst final : public Instruction {
+  /// Use Context::createInsertElementInst(). Don't call
+  /// the constructor directly.
----------------
slackito wrote:

Reworded it into a single line.

https://github.com/llvm/llvm-project/pull/102404