Support precompiled headers in clang/ar wrappers (#1668)

Author: s1341

libafl_cc/src/ar.rs

@@ -170,7 +170,7 @@ impl ToolWrapper for ArWrapper {
                         let extension = extension.to_str().unwrap();
                         let extension_lowercase = extension.to_lowercase();
                         match &extension_lowercase[..] {
-                            "o" | "lo" | "a" | "la" | "so" | "ao" | "c.o" => {
+                            "o" | "lo" | "a" | "la" | "so" | "ao" | "c.o" | "pch" => {
                                 configuration.replace_extension(&arg_as_path)
                             }
                             _ => arg_as_path,

libafl_cc/src/clang.rs

@@ -345,7 +345,7 @@ impl ToolWrapper for ClangWrapper {
                         let extension = extension.to_str().unwrap();
                         let extension_lowercase = extension.to_lowercase();
                         match &extension_lowercase[..] {
-                            "a" | "la" => configuration.replace_extension(&arg_as_path),
+                            "a" | "la" | "pch" => configuration.replace_extension(&arg_as_path),
                             _ => arg_as_path,
                         }
                     } else {