hg: jdk/jdk: 8227003: Add high-level JIT compilation mode control mechanism

[igor.veresov at oracle.com]

Changeset: b95bead30957
Author:    iveresov
Date:      2019-11-01 09:39 -0700
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/b95bead30957

8227003: Add high-level JIT compilation mode control mechanism
Summary: Add tiered mode to emulate non-tiered with special mode for JVMCI compiler. Add -XX:CompilationMode option.
Reviewed-by: never, redestad

! src/hotspot/share/compiler/compilerDefinitions.cpp
! src/hotspot/share/compiler/compilerDefinitions.hpp
! src/hotspot/share/compiler/tieredThresholdPolicy.cpp
! src/hotspot/share/compiler/tieredThresholdPolicy.hpp
! src/hotspot/share/runtime/arguments.cpp
! src/hotspot/share/runtime/flags/jvmFlagConstraintsCompiler.cpp
! src/hotspot/share/runtime/globals.hpp
! test/hotspot/jtreg/compiler/profiling/spectrapredefineclass/Launcher.java
! test/hotspot/jtreg/compiler/profiling/spectrapredefineclass_classloaders/Launcher.java
! test/hotspot/jtreg/serviceability/dcmd/vm/FlagsTest.java