Handle Windows line endings

Author: owenca

clang/lib/Format/FormatTokenLexer.cpp

@@ -710,8 +710,12 @@ void FormatTokenLexer::tryParseJavaTextBlock() {
   // From docs.oracle.com/en/java/javase/15/text-blocks/#text-block-syntax:
   // A text block begins with three double-quote characters followed by a line
   // terminator.
-  while (S < End && *S != '\n') {
-    if (!isblank(*S))
+  while (S < End) {
+    if (*S == '\n') {
+      ++S;
+      break;
+    }
+    if (!isspace(*S))
       return;
     ++S;
   }

clang/unittests/Format/FormatTestJava.cpp

@@ -836,7 +836,7 @@ TEST_F(FormatTestJava, TextBlock) {
       "  }\n"
       "}");
 
-  verifyNoChange("String name = \"\"\"\n"
+  verifyNoChange("String name = \"\"\"\r\n"
                  "        red\n"
                  "        green\n"
                  "        blue\\\n"