[Dependency Scanning] Do not specify '-fmodule-map-file' inputs on Swift interface dependency compilation jobs

Swift interfaces will only ever query module inputs by-name, so parsing modulemap files to resolve their headers is not necessary.

Author: artemcm

lib/DependencyScan/ScanDependencies.cpp

@@ -278,13 +278,6 @@ static llvm::Error resolveExplicitModuleInputs(
         commandLine.push_back("-Xcc");
         commandLine.push_back("-fmodule-file=" + depModuleID.ModuleName + "=" +
                               clangDepDetails->mappedPCMPath);
-        if (!instance.getInvocation()
-                 .getClangImporterOptions()
-                 .UseClangIncludeTree) {
-          commandLine.push_back("-Xcc");
-          commandLine.push_back("-fmodule-map-file=" +
-                                remapPath(clangDepDetails->moduleMapFile));
-        }
       }
       if (!clangDepDetails->moduleCacheKey.empty()) {
         commandLine.push_back("-Xcc");

test/ScanDependencies/explicit-swift-dependencies.swift

@@ -51,5 +51,5 @@ import F
 // CHECK-NEXT:            "{{.*}}{{/|\\}}F-{{.*}}.swiftmodule"
 // CHECK-DAG:             "-swift-module-file=Swift={{.*}}{{/|\\}}Swift-{{.*}}.swiftmodule"
 // CHECK-DAG:             "-swift-module-file=SwiftOnoneSupport={{.*}}{{/|\\}}SwiftOnoneSupport-{{.*}}.swiftmodule"
-// CHECK-DAG:             "-fmodule-file=F={{.*}}{{/|\\}}F-{{.*}}.pcm",
-// CHECK-DAG:             "-fmodule-file=SwiftShims={{.*}}{{/|\\}}SwiftShims-{{.*}}.pcm",
+// CHECK-DAG:             "-fmodule-file=F={{.*}}{{/|\\}}F-{{.*}}.pcm"
+// CHECK-DAG:             "-fmodule-file=SwiftShims={{.*}}{{/|\\}}SwiftShims-{{.*}}.pcm"