[clang-format] Fix ObjC method indent after f7f9f94

Commit
llvm@f7f9f94
changed the indent of ObjC method arguments from +4 to +2, if the method
occurs after a block statement.  I believe this was unintentional and there
was insufficient ObjC test coverage to catch this.

Example: `clang-format -style=google test.mm`

before:
```
void aaaaaaaaaaaaaaaaaaaaa(int c) {
  if (c) {
    f();
  }
  [dddddddddddddddddddddddddddddddddddddddddddddddddddddddd
      eeeeeeeeeeeeeeeeeeeeeeeeeeeee:^(fffffffffffffff gggggggg) {
        f(SSSSS, c);
      }];
}
```

after:
```
void aaaaaaaaaaaaaaaaaaaaa(int c) {
  if (c) {
    f();
  }
  [dddddddddddddddddddddddddddddddddddddddddddddddddddddddd
    eeeeeeeeeeeeeeeeeeeeeeeeeeeee:^(fffffffffffffff gggggggg) {
      f(SSSSS, c);
    }];
}
```

Differential Revision: https://reviews.llvm.org/D99063

Author: krasimirgg

clang/lib/Format/UnwrappedLineParser.cpp

@@ -649,7 +649,6 @@ void UnwrappedLineParser::parseBlock(bool MustBeDeclaration, unsigned AddLevels,
     nextToken();
 
   Line->Level = InitialLevel;
-  FormatTok->setBlockKind(BK_Block);
 
   if (PPStartHash == PPEndHash) {
     Line->MatchingOpeningBlockLineIndex = OpeningLineIndex;

clang/unittests/Format/FormatTestObjC.cpp

@@ -977,6 +977,19 @@ TEST_F(FormatTestObjC, FormatObjCMethodExpr) {
       "        performSelectorOnMainThread:@selector(loadAccessories)\n"
       "                         withObject:nil\n"
       "                      waitUntilDone:false];");
+
+  // The appropriate indentation is used after a block statement.
+  Style.ContinuationIndentWidth = 4;
+  verifyFormat(
+      "void aaaaaaaaaaaaaaaaaaaaa(int c) {\n"
+      "  if (c) {\n"
+      "    f();\n"
+      "  }\n"
+      "  [dddddddddddddddddddddddddddddddddddddddddddddddddddddddd\n"
+      "      eeeeeeeeeeeeeeeeeeeeeeeeeeeee:^(fffffffffffffff gggggggg) {\n"
+      "        f(SSSSS, c);\n"
+      "      }];\n"
+      "}");
 }
 
 TEST_F(FormatTestObjC, ObjCAt) {