RFR: 8329546: Assume sized integral types are available

[Kim Barrett]

On Tue, 2 Apr 2024 20:09:51 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change that cleans up the inclusion of <stdint.h> and
> <inttypes.h> when using gcc/clang as the compiler.
> 
> Testing: mach5 tier1

For what it's worth, I think once globalDefinitions_xlc.hpp is gone (https://github.com/openjdk/jdk/pull/18536)
that there is some more tidying up to be done.  I didn't want to go so far as touching that file when it's about to
vanish, and also didn't want to make changes where it was left inconsistent.

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PR Comment: https://git.openjdk.org/jdk/pull/18586#issuecomment-2033471223