[libcxx-commits] [libcxx] [libc++] Move std::abs into __math/abs.h (PR #139586)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h,cpp -- libcxx/include/__math/abs.h libcxx/include/math.h libcxx/include/stdlib.h libcxx/test/std/numerics/c.math/abs.verify.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/libcxx/test/std/numerics/c.math/abs.verify.cpp b/libcxx/test/std/numerics/c.math/abs.verify.cpp
index cc30112f0..9e5bfda52 100644
--- a/libcxx/test/std/numerics/c.math/abs.verify.cpp
+++ b/libcxx/test/std/numerics/c.math/abs.verify.cpp
@@ -13,10 +13,12 @@ void f() {
     (void)std::abs(ui); // expected-error {{call to 'abs' is ambiguous}}
 
     unsigned char uc = -5;
-    (void)std::abs(uc); // expected-warning 0-1 {{taking the absolute value of unsigned type 'unsigned char' has no effect}}
+    (void)std::abs(
+        uc); // expected-warning 0-1 {{taking the absolute value of unsigned type 'unsigned char' has no effect}}
 
     unsigned short us = -5;
-    (void)std::abs(us); // expected-warning 0-1 {{taking the absolute value of unsigned type 'unsigned short' has no effect}}
+    (void)std::abs(
+        us); // expected-warning 0-1 {{taking the absolute value of unsigned type 'unsigned short' has no effect}}
 
     unsigned long ul = -5;
     (void)std::abs(ul); // expected-error {{call to 'abs' is ambiguous}}

``````````

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https://github.com/llvm/llvm-project/pull/139586