Revert "Allow newlines in AST Matchers in clang-query files" + 1

Revert "Allow newlines in AST Matchers in clang-query files" + 1

Revert "Fix -Wunused-lambda-capture warnings."
This reverts commit 2369560f4a7720b19edfbf9de14ef061307ff773.
This reverts commit 522ee29a4fb3814db604b585c8637247477ec057.

clang/lib/ASTMatchers/Dynamic/Parser.cpp:610:13: warning: implicit conversion turns string literal into bool: 'const char [35]' to 'bool' [-Wstring-conversion]
    assert(!"Newline should never be found here");