Revert "Fix regression in bdad0a1b: force rebuilding of StmtExpr nodes in",...

Revert "Fix regression in bdad0a1b: force rebuilding of StmtExpr nodes in", "PR45083: Mark statement expressions as being dependent if they appear in"

This reverts commit f545ede9.
This reverts commit bdad0a1b.

This crashes clang. I'll follow up with reproduction instructions.