[compiler-rt] [compiler-rt] Simplify and rename of operator_new_size_type (PR #83912)

[Alexander Richardson via llvm-commits]

arichardson wrote:

> This broke building with MSVC for 32-bit x86: #101998. Can we revert it? It still seems to revert cleanly, and I can't really think of a better fix than putting the old `operator_new_size_type` back.

What is size_t on 32-bit windows? Is it `unsigned long` or `unsigned int` Surprised it's not the same as `uptr`? I will upload a patch shortly that should hopefully fix MSVC.


https://github.com/llvm/llvm-project/pull/83912