RFR: JDK-8300240: Replace NULL with nullptr in share/ci/

[Vladimir Kozlov]

On Tue, 17 Jan 2023 11:07:10 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Do the conversion in the share/ci/ sub-directory and all of its files.

Okay. After second look through I agree to use `null` in comments as it indeed sounds better.
I found several cases with `nullptr` in comments you missed. We should be consistent.
And one file which has copyright year update but no changes.

src/hotspot/share/ci/ciMethod.cpp line 786:

> 784: //
> 785: // Given a known receiver klass, find the target for the call.
> 786: // Return nullptr if the call has no target or the target is abstract.

Use `null`

src/hotspot/share/ci/ciMethod.cpp line 1035:

> 1033: // ciMethod::method_data_or_null
> 1034: // Returns a pointer to ciMethodData if MDO exists on the VM side,
> 1035: // nullptr otherwise.

Use `null`

src/hotspot/share/ci/ciMethodData.hpp line 522:

> 520: 
> 521:   // Get the data at an arbitrary bci, or null if there is none. If m
> 522:   // is not nullptr look for a SpeculativeTrapData if any first.

Use `null`

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Changes requested by kvn (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12029