[clang] [clang] Allow devirtualisation of indirect calls to final virtual methods (PR #165341)

[Chuanqi Xu via cfe-commits]

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@@ -0,0 +1,414 @@
+// Actual triple does not matter, just ensuring that the ABI being used for
+// mangling and similar is consistent. Choosing x86_64 as that seems to be a
+// configured target for most build configurations
+// RUN: %clang_cc1 -triple=x86_64 -std=c++26 %s -emit-llvm -O3                          -o - | FileCheck %s
+// RUN: %clang_cc1 -triple=x86_64 -std=c++26 %s -emit-llvm -O3 -fstrict-vtable-pointers -o - | FileCheck %s --check-prefix=STRICT
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ChuanqiXu9 wrote:

Yeah. 

nitpicking: not "correct" but "expected". (Although this doesn't matter). The idea is, actually we only changes/controls the CodeGen part. But we need the middle end part to optimize it. Then the new added test is helpful if someday the test fails, we can get the problem quickly to see if it is due to the CodeGen or due to the middle end part.

https://github.com/llvm/llvm-project/pull/165341