[clang] [Fuchsia] Disable new hdrgen in Fuchsia toolchain build (PR #100001)

[via cfe-commits]

https://github.com/zeroomega updated https://github.com/llvm/llvm-project/pull/100001

>From c9b293f39f935e961489bc8cbd1c91da190e7bdb Mon Sep 17 00:00:00 2001
From: Haowei Wu <haowei at google.com>
Date: Mon, 22 Jul 2024 16:13:14 -0700
Subject: [PATCH] [Fuchsia] Disable new hdrgen in Fuchsia toolchain build

We are seeing a PyYaml issue after the new libc_hdrgen was enabled
by default. This patch disables it in Fuchsia toolchain build so
we restore the builder while we are investigating.
---
 clang/cmake/caches/Fuchsia-stage2.cmake | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/clang/cmake/caches/Fuchsia-stage2.cmake b/clang/cmake/caches/Fuchsia-stage2.cmake
index 0218f0b21eb28..8e0835cb3158f 100644
--- a/clang/cmake/caches/Fuchsia-stage2.cmake
+++ b/clang/cmake/caches/Fuchsia-stage2.cmake
@@ -334,6 +334,7 @@ foreach(target armv6m-unknown-eabi;armv7m-unknown-eabi;armv8m.main-unknown-eabi)
   endforeach()
   set(RUNTIMES_${target}_LLVM_LIBC_FULL_BUILD ON CACHE BOOL "")
   set(RUNTIMES_${target}_LIBC_ENABLE_USE_BY_CLANG ON CACHE BOOL "")
+  set(RUNTIMES_${target}_LIBC_USE_NEW_HEADER_GEN OFF CACHE BOOL "")
   set(RUNTIMES_${target}_LIBCXX_ABI_VERSION 2 CACHE STRING "")
   set(RUNTIMES_${target}_LIBCXX_CXX_ABI none CACHE STRING "")
   set(RUNTIMES_${target}_LIBCXX_ENABLE_SHARED OFF CACHE BOOL "")
@@ -385,6 +386,7 @@ foreach(target riscv32-unknown-elf)
   endforeach()
   set(RUNTIMES_${target}_LLVM_LIBC_FULL_BUILD ON CACHE BOOL "")
   set(RUNTIMES_${target}_LIBC_ENABLE_USE_BY_CLANG ON CACHE BOOL "")
+  set(RUNTIMES_${target}_LIBC_USE_NEW_HEADER_GEN OFF CACHE BOOL "")
   set(RUNTIMES_${target}_LIBCXX_ABI_VERSION 2 CACHE STRING "")
   set(RUNTIMES_${target}_LIBCXX_CXX_ABI none CACHE STRING "")
   set(RUNTIMES_${target}_LIBCXX_ENABLE_SHARED OFF CACHE BOOL "")