[clang] [clang][cmake] Sanitize CLANG_BOLT values (PR #126768)

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https://github.com/serge-sans-paille created https://github.com/llvm/llvm-project/pull/126768

This avoids failing later in the build process.

>From 311777d5689fc2789e38967e8bb58077edb1a428 Mon Sep 17 00:00:00 2001
From: serge-sans-paille <sguelton at mozilla.com>
Date: Tue, 11 Feb 2025 18:20:15 +0100
Subject: [PATCH] [clang][cmake] Sanitize CLANG_BOLT values

This avoids failing later in the build process.
---
 clang/tools/driver/CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/clang/tools/driver/CMakeLists.txt b/clang/tools/driver/CMakeLists.txt
index ad336fcc45b60..40c0a622976e1 100644
--- a/clang/tools/driver/CMakeLists.txt
+++ b/clang/tools/driver/CMakeLists.txt
@@ -23,10 +23,14 @@ if(CLANG_PLUGIN_SUPPORT)
   set(support_plugins SUPPORT_PLUGINS)
 endif()
 
+set(CLANG_BOLT_ALLOWLIST INSTRUMENT PERF LBR)
 set(CLANG_BOLT OFF CACHE STRING "Apply BOLT optimization to Clang. \
-  May be specified as Instrument or Perf or LBR to use a particular profiling \
+May be specified as one of ${CLANG_BOLT_ALLOWLIST} to use a particular profiling \
   mechanism.")
 string(TOUPPER "${CLANG_BOLT}" CLANG_BOLT)
+if (NOT CLANG_BOLT IN_LIST CLANG_BOLT_ALLOWLIST)
+    message(FATAL_ERROR "Specified CLANG_BOLT value '${CLANG_BOLT}' is not one of ${CLANG_BOLT_ALLOWLIST}.")
+endif()
 
 if (CLANG_BOLT AND NOT LLVM_BUILD_INSTRUMENTED)
   set(CLANG_BOLT_DEPS clear-bolt-fdata llvm-bolt llvm-readobj)