Emerge Yul recompiler (#1)

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

crates/llvm-context/src/optimizer/settings/size_level.rs

@@ -0,0 +1,39 @@
+//!
+//! The LLVM optimizer settings size level.
+//!
+
+use serde::Deserialize;
+use serde::Serialize;
+
+///
+/// The LLVM optimizer settings size level.
+///
+#[derive(Debug, Serialize, Deserialize, Clone, Copy, PartialEq, Eq)]
+pub enum SizeLevel {
+    /// No size optimizations.
+    Zero,
+    /// The default size optimizations.
+    S,
+    /// The aggresize size optimizations.
+    Z,
+}
+
+impl From<SizeLevel> for u32 {
+    fn from(level: SizeLevel) -> Self {
+        match level {
+            SizeLevel::Zero => 0,
+            SizeLevel::S => 1,
+            SizeLevel::Z => 2,
+        }
+    }
+}
+
+impl std::fmt::Display for SizeLevel {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            SizeLevel::Zero => write!(f, "0"),
+            SizeLevel::S => write!(f, "s"),
+            SizeLevel::Z => write!(f, "z"),
+        }
+    }
+}