[clang-format] Fix line parsing for noexcept lambdas

[hultman]

Summary

$ echo "int c = [b]() mutable noexcept { return [&b] { return b++; }(); }();" |clang-format

int c = [b]() mutable noexcept {
  return [&b] { return b++; }();
}
();

with patch:

$ echo "int c = [b]() mutable noexcept { return [&b] { return b++; }(); }();" |bin/clang-format

int c = [b]() mutable noexcept { return [&b] { return b++; }(); }();

[hultman]

@benhamilton Would you mind landing the patch?

[hultman]

Ping

[benhamilton]

So sorry for the delay. I've landed this diff as rC352622.

lib/Format/UnwrappedLineParser.cpp

     case tok::numeric_constant:
     case tok::coloncolon:
     case tok::kw_mutable:
+    case tok::kw_noexcept:
       nextToken();
       break;
     case tok::arrow:

unittests/Format/FormatTest.cpp

 
 TEST_F(FormatTest, FormatsLambdas) {
   verifyFormat("int c = [b]() mutable { return [&b] { return b++; }(); }();\n");
+  verifyFormat(
+      "int c = [b]() mutable noexcept { return [&b] { return b++; }(); }();\n");
   verifyFormat("int c = [&] { [=] { return b++; }(); }();\n");
   verifyFormat("int c = [&, &a, a] { [=, c, &d] { return b++; }(); }();\n");
   verifyFormat("int c = [&a, &a, a] { [=, a, b, &c] { return b++; }(); }();\n");