RFR: 8259845: Move placeholder implementation details to cpp file and add logging

[Ioi Lam]

On Fri, 22 Jan 2021 21:17:48 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> See CR for details.
> Tested with tier1-3 and manually by looking at the output.

Marked as reviewed by iklam (Reviewer).

src/hotspot/share/classfile/placeholders.cpp line 269:

> 267: 
> 268: static void log(PlaceholderEntry* entry, const char* function, PlaceholderTable::classloadAction action) {
> 269:   if (log_is_enabled(Debug, class, load, placeholders)) {

Maybe `log()` should be explicitly declared as an inline function, so that the `if (log_is_enabled(Debug, class, load, placeholders))` can be checked without making a function call?

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PR: https://git.openjdk.java.net/jdk/pull/2204