[compiler-rt] [compiler-rt][x86] Don't use assert.h when building without a libc (PR #165384)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c -- compiler-rt/lib/builtins/cpu_model/x86.c --diff_from_common_commit
``````````

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``````````diff
diff --git a/compiler-rt/lib/builtins/cpu_model/x86.c b/compiler-rt/lib/builtins/cpu_model/x86.c
index f4851ae11..352bcc1da 100644
--- a/compiler-rt/lib/builtins/cpu_model/x86.c
+++ b/compiler-rt/lib/builtins/cpu_model/x86.c
@@ -248,7 +248,7 @@ struct __processor_model {
 } __cpu_model = {0, 0, 0, {0}};
 
 _Static_assert(sizeof(__cpu_model) == 16,
-              "Wrong size of __cpu_model will result in ABI break");
+               "Wrong size of __cpu_model will result in ABI break");
 
 // This code is copied from lib/Support/Host.cpp.
 // Changes to either file should be mirrored in the other.

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https://github.com/llvm/llvm-project/pull/165384