Implemented an internal getrandom to avoid calls to the public one in
table.h

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Co-authored-by: Sriya Pratipati <sriyap@google.com>

Removed strcmp, strlen, and memset calls from table.h and replaced them
with internal functions.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>

This is the first step in preparation for:
https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450

https://github.com/llvm/llvm-project/issues/139561

This prevents a conflict with the Linux system endian.h when built in
overlay mode for CPP files in __support.

This issue appeared in PR #106259.

This patch fixes:

randomness.h and getauxval.cpp were passing ssize_t as size_t
kernel_statx.h was assigning an uint64_t to uintptr_t
fopencookie.cpp was trying to create a FileIOResult using ssize_t but the constructor expected a size_t
thread.h was trying to call free_stack (which takes a size_t) with an unsigned long long. free_stack does the calculations using uintptr_t, so I changed the passing values to size_t

This is a part of #97655.

Reverts llvm/llvm-project#98075

bots are broken

This is a part of #97655.