Remove base-snapshot from the package-toolchain script

Author: kateinoigakukun

tools/build/package-toolchain

@@ -79,15 +79,13 @@ def copy_libxml2_libs(build_sdk_path, dist_toolchain_path, target_triple):
 class PackageSwiftSDKAction(Action):
     def __init__(
         self, options, snapshot_info: SnapshotInfo,
-        base_toolchain_path: str,
         target_toolchain_path: str,
         wasi_sysroot_path: str,
         swift_sdk_name: str,
         target_triple: str,
     ):
         super().__init__(options)
         self.snapshot_info = snapshot_info
-        self.base_toolchain_path = base_toolchain_path
         self.target_toolchain_path = target_toolchain_path
         self.wasi_sysroot_path = wasi_sysroot_path
         self.swift_sdk_name = swift_sdk_name
@@ -98,7 +96,6 @@ class PackageSwiftSDKAction(Action):
         copy_icu_libs(self.options.scheme, build_sdk_path, self.target_toolchain_path, self.target_triple)
         copy_libxml2_libs(build_sdk_path, self.target_toolchain_path, self.target_triple)
         self.make_swift_sdk(
-            self.base_toolchain_path,
             self.target_toolchain_path,
             self.wasi_sysroot_path,
             self.swift_sdk_name,
@@ -107,7 +104,6 @@ class PackageSwiftSDKAction(Action):
 
     def make_swift_sdk(
         self,
-        base_toolchain_path: str,
         target_toolchain_path: str,
         wasi_sysroot_path: str,
         swift_sdk_name: str,
@@ -116,8 +112,6 @@ class PackageSwiftSDKAction(Action):
         """
         Build the Swift SDK for WebAssembly.
 
-        :param base_toolchain_path: The path to the base toolchain, which
-            is an upstream toolchain downloaded from swift.org/download.
         :param target_toolchain_path: The path to the target toolchain, which
             contains the cross-compiled Swift standard library and SDK for
             WebAssembly.
@@ -170,17 +164,6 @@ class PackageSwiftSDKAction(Action):
         self.system(*zip_args)
         os.chdir(old_cwd)
 
-    def get_default_target_triple(self, base_toolchain_path: str):
-        import subprocess
-        swift_frontend_path = os.path.join(
-            base_toolchain_path, "usr", "bin", "swift-frontend")
-        # Use subprocess instead of self.system to run it even in dry-run
-        output = subprocess.check_output(
-            [swift_frontend_path, "-print-target-info"],
-            universal_newlines=True)
-        info = json.loads(output)
-        return info["target"]["triple"]
-
 
 class CleanBuildArtifactAction(Action):
     def run(self):
@@ -281,7 +264,6 @@ def main():
         )
         actions.append(PackageSwiftSDKAction(
             options, snapshot_info,
-            base_toolchain_path=os.path.join(packaging_dir, 'base-snapshot'),
             target_toolchain_path=os.path.join(packaging_dir, 'target-toolchain', target_triple),
             wasi_sysroot_path=derive_wasi_sysroot(options, packaging_dir, short_triple),
             swift_sdk_name=f"{snapshot_info.swift_version}-{target_triple}",