RFR: 8259894: refactor parts of jvm.h into jvm_io.h and jvm_constants.h [v2]

[Ioi Lam]

> jvm.h is over 1000 lines long. It is included by 940 out of 1000 HotSpot .o files. However, most of the HotSpot source files just use a small fraction of jvm.h:
> 
> - the jio_xxxprintf() functions
> - the JVM_RECOGNIZED_XXX_MODIFIERS defines
> 
> We should move these two parts into jvm_io.h and jvm_constants.h. This reduces the files that include jvm.h to about 82 files. Build time of HotSpot is reduced by about 0.4%.
> 
> Testing: mach5: tier1, builds-tier2, builds-tier3, builds-tier4 and builds-tier5. Also locally: aarch64, arm, ppc64, s390, x86, and zero.

Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:

  David Holmes comments

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2154/files
  - new: https://git.openjdk.java.net/jdk/pull/2154/files/f3cce1ba..00fc5db5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2154&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2154&range=00-01

  Stats: 16 lines in 5 files changed: 2 ins; 3 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2154.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2154/head:pull/2154

PR: https://git.openjdk.java.net/jdk/pull/2154