apply size optimizations by default (#298)

So far if no optimization level was specified, optimizations for
execution time were applied. However, we currently are a bit limited on
code size. Add to that, this setting is not available in solc and people
generally ignore the docs, generating a lot of support requests.

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>

CHANGELOG.md

@@ -6,9 +6,16 @@ This is a development pre-release.
 
 Supported `polkadot-sdk` rev:`c29e72a8628835e34deb6aa7db9a78a2e4eabcee`
 
+## v0.1.0
+
+This is a development pre-release.
+
+Supported `polkadot-sdk` rev:`c29e72a8628835e34deb6aa7db9a78a2e4eabcee`
+
 ### Added
 
 ### Changed
+- By default, heavy size optimizations are applied.
 
 ### Fixed
 

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

@@ -234,7 +234,7 @@ impl TryFrom<&SolcStandardJsonInputSettingsOptimizer> for Settings {
     fn try_from(value: &SolcStandardJsonInputSettingsOptimizer) -> Result<Self, Self::Error> {
         let mut result = match value.mode {
             Some(mode) => Self::try_from_cli(mode)?,
-            None => Self::cycles(),
+            None => Self::size(),
         };
         if value.fallback_to_optimizing_for_size.unwrap_or_default() {
             result.enable_fallback_to_size();

crates/solidity/src/resolc/main.rs

@@ -129,7 +129,7 @@ fn main_inner() -> anyhow::Result<()> {
 
     let mut optimizer_settings = match arguments.optimization {
         Some(mode) => revive_llvm_context::OptimizerSettings::try_from_cli(mode)?,
-        None => revive_llvm_context::OptimizerSettings::cycles(),
+        None => revive_llvm_context::OptimizerSettings::size(),
     };
     if arguments.fallback_to_optimizing_for_size {
         optimizer_settings.enable_fallback_to_size();