[lworld] RFR: Merge jdk [v2]

[David Simms]

> Merge tag 'jdk-17+8' into lworld_merge_jdk_17_8
> Logical merge compilation fixes

David Simms has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 1083 commits:

 - Logical merge compilation fixes
 - Merge tag 'jdk-17+8' into lworld_merge_jdk_17_8
   
   Added tag jdk-17+8 for changeset f025bc1d
   
   # Conflicts:
   #	src/hotspot/cpu/x86/c1_MacroAssembler_x86.cpp
   #	src/hotspot/share/c1/c1_Compilation.cpp
   #	src/hotspot/share/c1/c1_LIRAssembler.cpp
   #	src/hotspot/share/ci/ciInstanceKlass.cpp
   #	src/hotspot/share/classfile/classFileParser.cpp
   #	src/hotspot/share/classfile/placeholders.hpp
   #	src/hotspot/share/classfile/systemDictionary.cpp
   #	src/hotspot/share/classfile/systemDictionary.hpp
   #	src/hotspot/share/classfile/verificationType.cpp
   #	src/hotspot/share/compiler/compileBroker.cpp
   #	src/hotspot/share/memory/metaspaceClosure.hpp
   #	src/hotspot/share/memory/universe.cpp
   #	src/hotspot/share/oops/arrayKlass.cpp
   #	src/hotspot/share/oops/objArrayKlass.cpp
   #	src/hotspot/share/opto/parse2.cpp
   #	src/hotspot/share/prims/jvm.cpp
   #	test/hotspot/jtreg/vmTestbase/jit/tiered/Test.java
   #	test/jdk/java/lang/invoke/VarHandles/VarHandleTestMethodHandleAccessBoolean.java
   #	test/jdk/java/lang/invoke/VarHandles/VarHandleTestMethodHandleAccessByte.java
   #	test/jdk/java/lang/invoke/VarHandles/VarHandleTestMethodHandleAccessChar.java
   #	test/jdk/java/lang/invoke/VarHandles/VarHandleTestMethodHandleAccessDouble.java
   #	test/jdk/java/lang/invoke/VarHandles/VarHandleTestMethodHandleAccessFloat.java
   #	test/jdk/java/lang/invoke/VarHandles/VarHandleTestMethodHandleAccessInt.java
   #	test/jdk/java/lang/invoke/VarHandles/VarHandleTestMethodHandleAccessLong.java
   #	test/jdk/java/lang/invoke/VarHandles/VarHandleTestMethodHandleAccessShort.java
   #	test/jdk/java/lang/invoke/VarHandles/VarHandleTestMethodHandleAccessString.java
   #	test/jdk/java/lang/invoke/VarHandles/X-VarHandleTestMethodHandleAccess.java.template
 - 8260363: [lworld] C2 compilation fails with assert(n->Opcode() != Op_Phi) failed: cannot match
   
   Reviewed-by: thartmann
 - Merge jdk
   
   Merge to 20210119
 - [lworld] code cleanup reverting some old leftover change
 - [lworld] Field::get should return default value instead of null on non-flattened inline field
   
   Reviewed-by: rriggs
 - 8260375: [lworld] ValueTearing fails with -XX:FlatArrayElementMaxSize=0 -XX:InlineFieldMaxFlatSize=0
   
   Reviewed-by: thartmann
 - Remove unused field from Method
   
   Reviewed-by: hseigel, lfoltan
 - 8260283: [lworld] C1's EliminateFieldAccess optimization fails with "wrong types"
   
   Reviewed-by: fparain
 - 8260225: [lworld] C1's delayed load indexed optimization sets incorrect type
   
   Reviewed-by: fparain
 - ... and 1073 more: https://git.openjdk.java.net/valhalla/compare/f025bc1d...604b0cb2

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

Changes: https://git.openjdk.java.net/valhalla/pull/319/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=319&range=01
  Stats: 144118 lines in 1307 files changed: 137496 ins; 2036 del; 4586 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/319.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/319/head:pull/319

PR: https://git.openjdk.java.net/valhalla/pull/319