Improve release compile time

Author: tesuji

Cargo.toml

@@ -62,3 +62,7 @@ rustc_tools_util = { version = "0.2.0", path = "rustc_tools_util"}
 [features]
 deny-warnings = []
 integration = ["git2", "tempfile"]
+
+# Reduce build time by setting proc-macro crates non optimized.
+[profile.release.build-override]
+opt-level = 0

clippy_dev/Cargo.toml

@@ -14,3 +14,7 @@ walkdir = "2"
 
 [features]
 deny-warnings = []
+
+# Reduce build time by setting proc-macro crates non optimized.
+[profile.release.build-override]
+opt-level = 0

clippy_dummy/Cargo.toml

@@ -15,3 +15,7 @@ categories = ["development-tools", "development-tools::cargo-plugins"]
 
 [build-dependencies]
 term = "0.6"
+
+# Reduce build time by setting proc-macro crates non optimized.
+[profile.release.build-override]
+opt-level = 0