[clang] [llvm] [Clang][C++23] Core language changes from P1467R9 extended floating-point types and standard names. (PR #78503)

[Joshua Cranmer via llvm-commits]

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+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --function-signature
+// RUN: %clang_cc1 -std=c++23 -triple x86_64-unknown-unknown -target-feature +fullbf16 -emit-llvm %s -o - | FileCheck %s  --check-prefix=CHECK
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jcranmer-intel wrote:

x86 is unfortunately pretty tame as far as testing these rules goes. You should also test on:
* a target where double = long double = IEEE double-precision
* a target where long double = IEEE quad-precision
* a target where long double = `ppc_fp128`

https://github.com/llvm/llvm-project/pull/78503