[PATCH] D113749: [Clang] Fix nesting of discarded an immediate context.

[Corentin Jabot via Phabricator via cfe-commits]

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In C++23, discarded statements and if consteval statements can nest
arbitrarily. To support that, we
keep track of whether the parent of the current evaluation context
is discarded or immediate.

This is done at the construction of an evaluation context
to improve performance.

Fixes https://bugs.llvm.org/show_bug.cgi?id=52231


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D113749

Files:
  clang/include/clang/Sema/Sema.h
  clang/lib/Sema/SemaExpr.cpp
  clang/lib/Sema/SemaStmt.cpp
  clang/test/SemaCXX/cxx2b-consteval-if.cpp

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