Swift: add -merge-modules to frontend-invocations test

Also, moved from Makefile to a bash source.

Author: redsun82

swift/integration-tests/.gitignore

@@ -7,3 +7,4 @@ DerivedData/
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 *.actual
 db
+*.swiftmodule

swift/integration-tests/posix-only/frontend-invocations/F1.swift

@@ -3,4 +3,6 @@
 | C.swift:0:0:0:0 | C.swift |
 | D.swift:0:0:0:0 | D.swift |
 | E.swift:0:0:0:0 | E.swift |
+| F1.swift:0:0:0:0 | F1.swift |
+| F2.swift:0:0:0:0 | F2.swift |
 | file://:0:0:0:0 |  |

swift/integration-tests/posix-only/frontend-invocations/F2.swift

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+if [[ "$(uname)" == Darwin ]]; then
+  SDK="-sdk $(xcrun -show-sdk-path)"
+  FRONTEND="$(xcrun -find swift-frontend)"
+else
+  SDK=""
+  FRONTEND="swift-frontend"
+fi
+
+$FRONTEND -frontend -c A.swift $SDK
+$FRONTEND -frontend -c B.swift -o B.o $SDK
+$FRONTEND -frontend -c -primary-file C.swift $SDK
+$FRONTEND -frontend -c -primary-file D.swift -o D.o $SDK
+$FRONTEND -frontend -c -primary-file E.swift Esup.swift -o E.o $SDK
+$FRONTEND -frontend -emit-module -primary-file F1.swift F2.swift -module-name F -o F1.swiftmodule $SDK
+$FRONTEND -frontend -emit-module F1.swift -primary-file F2.swift -module-name F -o F2.swiftmodule $SDK
+$FRONTEND -merge-modules F1.swiftmodule F2.swiftmodule -o F.swiftmodule $SDK

swift/integration-tests/posix-only/frontend-invocations/Files.expected

@@ -1,5 +1,5 @@
 from create_database_utils import *
 
 run_codeql_database_create([
-    'make',
+    './build.sh',
 ], lang='swift')