[llvm] [libcxx] [libc++][NFC] Make AssertionInfoMatcher::CheckMessageMatches Stricter (PR #77721)

[Mark de Wever via llvm-commits]

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@@ -349,6 +349,8 @@ function(llvm_ExternalProject_Add name source_dir)
                -DPACKAGE_VERSION=${PACKAGE_VERSION}
                -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
                -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
+               -DLLVM_ENABLE_SPHINX=${LLVM_ENABLE_SPHINX}
+               -DLLVM_BUILD_DOCS=${LLVM_BUILD_DOCS}
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mordante wrote:

Why are these changes needed? If needed, I think it would be better to do this in a separate review.

https://github.com/llvm/llvm-project/pull/77721