[libc] [llvm] [libc][math] Refactor atan2f implementation to header-only in src/__support/math folder. (PR #150993)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- libc/shared/math/atan2f.h libc/src/__support/math/atan2f.h libc/shared/math.h libc/src/math/generic/atan2f.cpp libc/test/shared/shared_math_test.cpp libc/src/__support/math/atan2f_float.h
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View the diff from clang-format here.
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``````````diff
diff --git a/libc/src/__support/math/atan2f_float.h b/libc/src/__support/math/atan2f_float.h
index 01d3fb162..8bd70958a 100644
--- a/libc/src/__support/math/atan2f_float.h
+++ b/libc/src/__support/math/atan2f_float.h
@@ -242,4 +242,4 @@ LIBC_INLINE static constexpr float atan2f(float y, float x) {
 
 } // namespace LIBC_NAMESPACE_DECL
 
-#endif  // LIBC_SRC___SUPPORT_MATH_ATAN2F_FLOAT_H
+#endif // LIBC_SRC___SUPPORT_MATH_ATAN2F_FLOAT_H

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https://github.com/llvm/llvm-project/pull/150993