[UnitTests] Fix unittest build on after upstream revert llvm#107906

Fix build failure in unit test.

rdar://136591087

Author: cachemeifyoucan

llvm/unittests/CAS/CASProvidingFileSystemTest.cpp

@@ -52,8 +52,7 @@ TEST(CASProvidingFileSystemTest, Basic) {
     std::optional<cas::ObjectRef> CASContents;
     auto Buf = CASFS->getBufferForFile(Path2, /*FileSize*/ -1,
                                        /*RequiresNullTerminator*/ false,
-                                       /*IsVolatile*/ false, /*IsText*/ true,
-                                       &CASContents);
+                                       /*IsVolatile*/ false, &CASContents);
     ASSERT_TRUE(Buf);
     EXPECT_EQ(Contents2, (*Buf)->getBuffer());
     ASSERT_TRUE(CASContents);

llvm/unittests/Support/PrefixMapperTest.cpp

@@ -349,8 +349,7 @@ class GetDirectoryEntryFileSystem : public vfs::FileSystem {
   ErrorOr<std::string> getCurrentWorkingDirectory() const override {
     return make_error_code(std::errc::operation_not_permitted);
   }
-  ErrorOr<std::unique_ptr<vfs::File>> openFileForRead(const Twine &,
-                                                      bool) override {
+  ErrorOr<std::unique_ptr<vfs::File>> openFileForRead(const Twine &) override {
     return make_error_code(std::errc::operation_not_permitted);
   }