[Tooling/Inclusion] Add the generic abs symbol to the table.

[hokein]

Summary

Fixes https://github.com/llvm/llvm-project/issues/60964

[kadircet]

this fixes the abs in the mentioned issue, but leaves the friends out :( those are specifically std::labs, std::llabs, std::imaxabs

[hokein]

In D144721#4150122, @kadircet wrote:

this fixes the abs in the mentioned issue, but leaves the friends out :( those are specifically std::labs, std::llabs, std::imaxabs

These symbols are already covered in the generated StdSymbolMap.inc file :)

[kadircet]

oh right, i thought these were also provided by multiple headers, but looks like they're only provided by cstdlib, thanks!

clang/lib/Tooling/Inclusions/Stdlib/StdSpecialSymbolMap.inc

 SYMBOL(ssize, std::, <set>)
 SYMBOL(ssize, std::, <span>)
 SYMBOL(ssize, std::, <string>)
 SYMBOL(ssize, std::, <string_view>)
 SYMBOL(ssize, std::, <unordered_map>)
 SYMBOL(ssize, std::, <unordered_set>)
 SYMBOL(ssize, std::, <vector>)
 
+// Add headers for generic integer-type abs.
+// Ignore other variants (std::complex, std::valarray, std::intmax_t)
+SYMBOL(abs, std::, <cstdlib>)
+SYMBOL(abs, std::, <cmath>)
+SYMBOL(abs, None, <cstdlib>)
+SYMBOL(abs, None, <stdlib.h>)
+SYMBOL(abs, None, <cmath>)
+SYMBOL(abs, None, <math.h>)
+
 // std::get has a few variants for different types (tuple, array, pair etc)
 // which is tricky to disambiguate without type information.
 // Don't set any header for it, as it comes with the type header.
 SYMBOL(get, std::, /*no headers*/)
 
 // Macros
 SYMBOL(NULL, None, <cstddef>)
 SYMBOL(NULL, None, <stddef.h>)