8171266: PPC64: Add support to -XX:RTMSpinLoopCount=0 Reviewed-by: mdoerr, dholmes

8172010: [AOT] RecompilationTest.java fails with "expected compilation level after compilation to be no less than 1" Summary: Disabled probabilistic profiling to ensure recompilation of AOT compiled method. Reviewed-by: kvn, iveresov

8172246: [TESTBUG] runtime/RedefineTests/RedefinePreviousVersions.java 'Class unloading: has_previous_versions = true' missing from stdout/stderr Summary: add boolean to gate redefinition start Reviewed-by: sspitsyn, dholmes

8172054: Aot tests should include Java assertions into AOT compiled code Reviewed-by: iveresov

8168137: import-hotspot build target not removed from hotspot-ide-project Reviewed-by: erikj

8171974: Fix for R10 Register clobbering with usage of ExternalAddress Reviewed-by: kvn, rbackman

8172169: Re-examine String field optionality Reviewed-by: kvn, thartmann

8172199: s390: Use same get_key_start_from_aescrypt_object implementation as PPC64 Reviewed-by: kvn

8172049: [s390] Implement "JEP 270: Reserved Stack Areas for Critical Sections". Reviewed-by: mdoerr

8172145: C2: anti dependence missed because store hidden by membar Reviewed-by: kvn

8170857: Typo in -Xlog:help output Reviewed-by: dholmes

8170855: Example for -Xlog:help do not contain one with multiple tags Reviewed-by: dholmes

8171082: [AOT] AOT'd SystemModules.modules() fails to load when too large Reviewed-by: kvn, redestad

8156762: test/compiler/ciReplay/TestVMNoCompLevel.java fails with - 'Unexpected exit code for negative case: [-client]: expected 0 to not equal 0' Summary: Corrected CLIENT_VM_AVAILABLE case Reviewed-by: dpochepk, zmajo

8172149: CTW library should call System::exit Reviewed-by: vlivanov

Merge