8166125: [JVMCI] Missing JVMCI flag default values Reviewed-by: twisti, kvn

Merge

8172098: A lot of gtests uses TEST instead of TEST_VM Reviewed-by: iignatyev

8170959: unloading archived shared class caused crash Reviewed-by: coleenp, sspitsyn, mockner

8171435: "assert(is_single_cpu() && !is_virtual()) failed: type check" with -XX:+PatchALot on SPARC Summary: Fixed several issues with PatchALot or unaligned accesses on SPARC. Reviewed-by: kvn

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