Update code base to use LLVM 21 (#434)

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>
Co-authored-by: LJ <81748770+elle-j@users.noreply.github.com>
Co-authored-by: xermicus <cyrill@parity.io>

crates/integration/codesize.json

@@ -1,10 +1,10 @@
 {
-  "Baseline": 864,
-  "Computation": 2323,
-  "DivisionArithmetics": 14475,
-  "ERC20": 17229,
-  "Events": 1663,
-  "FibonacciIterative": 1421,
-  "Flipper": 2154,
-  "SHA1": 7751
+  "Baseline": 870,
+  "Computation": 2418,
+  "DivisionArithmetics": 9327,
+  "ERC20": 17160,
+  "Events": 1662,
+  "FibonacciIterative": 1427,
+  "Flipper": 2240,
+  "SHA1": 8009
 }