Support solc v0.8.31 (#430)

- Support for solc v0.8.31.
- Support for the `clz` Yul builtin.

---------

Signed-off-by: xermicus <cyrill@parity.io>

crates/yul/src/parser/statement/expression/function_call/mod.rs

@@ -348,6 +348,14 @@ impl FunctionCall {
                 )
                 .map(Some)
             }
+            Name::Clz => {
+                let arguments = self.pop_arguments_llvm::<1>(context)?;
+                revive_llvm_context::polkavm_evm_bitwise::count_leading_zeros(
+                    context,
+                    arguments[0].into_int_value(),
+                )
+                .map(Some)
+            }
             Name::Byte => {
                 let arguments = self.pop_arguments_llvm::<2>(context)?;
                 revive_llvm_context::polkavm_evm_bitwise::byte(

crates/yul/src/parser/statement/expression/function_call/name.rs

@@ -54,6 +54,8 @@ pub enum Name {
     Shr,
     /// signed arithmetic shift right `y` by `x` bits
     Sar,
+    /// number of leading zero bits of x, 256 if x == 0
+    Clz,
     /// `n`th byte of `x`, where the most significant byte is the `0`th byte
     Byte,
     /// discard value x
@@ -270,6 +272,7 @@ impl From<&str> for Name {
             "shl" => Self::Shl,
             "shr" => Self::Shr,
             "sar" => Self::Sar,
+            "clz" => Self::Clz,
             "byte" => Self::Byte,
             "pop" => Self::Pop,
 
@@ -393,6 +396,7 @@ impl fmt::Display for Name {
             Self::Shl => "shl",
             Self::Shr => "shr",
             Self::Sar => "sar",
+            Self::Clz => "clz",
             Self::Byte => "byte",
             Self::Pop => "pop",