Emerge Yul recompiler (#1)

Provide a modified (and incomplete) version of ZKSync zksolc that can compile the most basic contracts

crates/solidity/src/evmla/ethereal_ir/function/queue_element.rs

@@ -0,0 +1,35 @@
+//!
+//! The Ethereal IR block queue element.
+//!
+
+use crate::evmla::ethereal_ir::function::block::element::stack::Stack;
+
+///
+/// The Ethereal IR block queue element.
+///
+#[derive(Debug, Clone)]
+pub struct QueueElement {
+    /// The block key.
+    pub block_key: era_compiler_llvm_context::EraVMFunctionBlockKey,
+    /// The block predecessor.
+    pub predecessor: Option<(era_compiler_llvm_context::EraVMFunctionBlockKey, usize)>,
+    /// The predecessor's last stack state.
+    pub stack: Stack,
+}
+
+impl QueueElement {
+    ///
+    /// A shortcut constructor.
+    ///
+    pub fn new(
+        block_key: era_compiler_llvm_context::EraVMFunctionBlockKey,
+        predecessor: Option<(era_compiler_llvm_context::EraVMFunctionBlockKey, usize)>,
+        stack: Stack,
+    ) -> Self {
+        Self {
+            block_key,
+            predecessor,
+            stack,
+        }
+    }
+}