incorrect source range for the CoyieldExpr AST node

[hokein]

Chat get(int s) { 
  co_yield s; // incorrect source range, line 69
  co_return s;
  co_await s;
}

The source range of the CoyieldExpr only covers the co_yield token. This seems to happen on CoyieldExpr node only (the other node CoreturnExpr and CoawaitExpr are fine).

|-ExprWithCleanups 0xca71878 <line:69:3> 'void'
  | | `-CoyieldExpr 0xca71830 <col:3> 'void'
  | |   |-CXXMemberCallExpr 0xca714a8 <col:3> 'std::suspend_always':'std::suspend_always'
  | |   | |-MemberExpr 0xca71478 <col:3> '<bound member function type>' .yield_value 0xca668b0
  | |   | | `-DeclRefExpr 0xca71458 <col:3> 'std::coroutine_traits<Chat, int>::promise_type':'Chat::promise_type' lvalue Var 0xca6e7e8 '__promise' 'std::coroutine_traits<Chat, int>::promise_type':'Chat::promise_type'
  | |   | `-ImplicitCastExpr 0xca714d0 <col:12> 'int' <LValueToRValue>
  | |   |   `-DeclRefExpr 0xca6cee8 <col:12> 'int' lvalue ParmVar 0xca6ccc0 's' 'int'

See the full example: https://godbolt.org/z/GcKP5r9xn

[llvmbot]

@llvm/issue-subscribers-coroutines

[danix800]

Fixed https://reviews.llvm.org/D157296