[AST] Fix -Wlogical-op-parentheses in ExprConstant.cpp (NFC)

llvm-project/clang/lib/AST/ExprConstant.cpp:5645:74: error: '&&' within '||' [-Werror,-Wlogical-op-parentheses]
 5645 |       (Definition->isConstexpr() || Info.CurrentCall->CanEvalMSConstexpr &&
      |                                  ~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
 5646 |                                         Definition->hasAttr<MSConstexprAttr>()))
      |                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
llvm-project/clang/lib/AST/ExprConstant.cpp:5645:74: note: place parentheses around the '&&' expression to silence this warning
 5645 |       (Definition->isConstexpr() || Info.CurrentCall->CanEvalMSConstexpr &&
      |                                                                          ^
      |                                     (
 5646 |                                         Definition->hasAttr<MSConstexprAttr>()))
      |
      |                                                                               )
1 error generated.