Revert "Remove getCode usage as it is not type safe apparently, see https://github.com/phpstan/phpstan-src/pull/795"

This reverts commit 84f8fda0c6.

And other issues fixed by PHPStan 1.3.2

src/Composer/Console/Application.php

@@ -348,7 +348,7 @@ class Application extends BaseApplication
 
             return $result;
         } catch (ScriptExecutionException $e) {
-            return (int) $e->getCode();
+            return $e->getCode();
         } catch (\Exception $e) {
             $ghe = new GithubActionError($this->io);
             $ghe->emit($e->getMessage());

src/Composer/DependencyResolver/SolverProblemsException.php

@@ -39,14 +39,6 @@ class SolverProblemsException extends \RuntimeException
         parent::__construct('Failed resolving dependencies with '.count($problems).' problems, call getPrettyString to get formatted details', self::ERROR_DEPENDENCY_RESOLUTION_FAILED);
     }
 
-    /**
-     * @return self::ERROR_DEPENDENCY_RESOLUTION_FAILED
-     */
-    public function getExitCode()
-    {
-        return self::ERROR_DEPENDENCY_RESOLUTION_FAILED;
-    }
-
     /**
      * @param bool $isVerbose
      * @param bool $isDevExtraction

src/Composer/Installer.php

@@ -455,7 +455,7 @@ class Installer
             $ghe = new GithubActionError($this->io);
             $ghe->emit($err."\n".$prettyProblem);
 
-            return max(self::ERROR_GENERIC_FAILURE, $e->getExitCode());
+            return max(self::ERROR_GENERIC_FAILURE, $e->getCode());
         }
 
         $this->io->writeError("Analyzed ".count($pool)." packages to resolve dependencies", true, IOInterface::VERBOSE);
@@ -633,7 +633,7 @@ class Installer
             $ghe = new GithubActionError($this->io);
             $ghe->emit($err."\n".$prettyProblem);
 
-            return max(self::ERROR_GENERIC_FAILURE, $e->getExitCode());
+            return max(self::ERROR_GENERIC_FAILURE, $e->getCode());
         }
 
         $lockTransaction->setNonDevPackages($nonDevLockTransaction);
@@ -703,7 +703,7 @@ class Installer
                 $ghe = new GithubActionError($this->io);
                 $ghe->emit($err."\n".$prettyProblem);
 
-                return max(self::ERROR_GENERIC_FAILURE, $e->getExitCode());
+                return max(self::ERROR_GENERIC_FAILURE, $e->getCode());
             }
         }