Add test coverage for stable dir during by-name lookups.

Author: qiongsiwu

clang/test/ClangScanDeps/modules-full-by-mult-mod-names.c

@@ -22,20 +22,43 @@ module root1 { header "root1.h"}
 // This is here to verify that the "root" directory doesn't clash with name of
 // the "root" module.
 
+// Verify the stable dir path.
+//--- Sysroot/usr/include/SysA/module.modulemap
+module SysA {
+  header "SysA.h"
+}
+
+//--- Sysroot/usr/include/SysA/SysA.h
+int SysVal = 42;
+
 //--- cdb.json.template
 [{
   "file": "",
   "directory": "DIR",
-  "command": "clang -fmodules -fmodules-cache-path=DIR/cache -I DIR -x c"
+  "command": "clang -fmodules -fmodules-cache-path=DIR/cache -I DIR -isysroot DIR/Sysroot -IDIR/Sysroot/usr/include -x c"
 }]
 
 // RUN: sed "s|DIR|%/t|g" %t/cdb.json.template > %t/cdb.json
-// RUN: clang-scan-deps -compilation-database %t/cdb.json -format experimental-full -module-names=root,root1,direct > %t/result.json
+// RUN: clang-scan-deps -compilation-database %t/cdb.json -format experimental-full -module-names=SysA,root,root1,direct > %t/result.json
 // RUN: cat %t/result.json | sed 's:\\\\\?:/:g' | FileCheck -DPREFIX=%/t %s
 
 // CHECK:      {
 // CHECK-NEXT:   "modules": [
 // CHECK-NEXT:     {
+// CHECK-NEXT:       "is-in-stable-directories": true,
+// CHECK-NEXT:       "clang-module-deps": [],
+// CHECK-NEXT:       "clang-modulemap-file": "[[PREFIX]]/Sysroot/usr/include/SysA/module.modulemap",
+// CHECK-NEXT:       "command-line": [
+// CHECK:            ],
+// CHECK-NEXT:       "context-hash": "{{.*}}",
+// CHECK-NEXT:       "file-deps": [
+// CHECK-NEXT:         "[[PREFIX]]/Sysroot/usr/include/SysA/module.modulemap",
+// CHECK-NEXT:         "[[PREFIX]]/Sysroot/usr/include/SysA/SysA.h"
+// CHECK-NEXT:       ],
+// CHECK-NEXT:       "link-libraries": [],
+// CHECK-NEXT:       "name": "SysA"
+// CHECK-NEXT:     },
+// CHECK-NEXT:     {
 // CHECK-NEXT:       "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "{{.*}}",