[clangd] Get rid of delayed template parsing

[kadircet]

Summary

No need to pass fno-delayed-template-parsing as the opposite flag is
only passed to cc1 when abi is set to msvc. Sending as a follow-up to D73613 to
keep changes in the release branch minimal.

[merge_guards_bot]

Unit tests: unknown.

clang-tidy: unknown.

clang-format: unknown.

Build artifacts: diff.json, console-log.txt

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clang-tools-extra/clangd/unittests/HoverTests.cpp

class Foo {})cpp";
        }},
   };
   for (const auto &Case : Cases) {
     SCOPED_TRACE(Case.Code);
 
     Annotations T(Case.Code);
     TestTU TU = TestTU::withCode(T.code());
     TU.ExtraArgs.push_back("-std=c++17");
-    // FIXME: This is no longer necessary, as the default behavior is no delayed
-    // parsing in the triplet below.
-    TU.ExtraArgs.push_back("-fno-delayed-template-parsing");
     // Types might be different depending on the target triplet, we chose a
     // fixed one to make sure tests passes on different platform.
     TU.ExtraArgs.push_back("--target=x86_64-pc-linux-gnu");
     auto AST = TU.build();
 
     auto H = getHover(AST, T.point(), format::getLLVMStyle(), nullptr);
     ASSERT_TRUE(H);
     HoverInfo Expected;