[vm/compiler] Add all Compressed Assembler methods to AssemblerBase.

Remove CompareWithCompressedFieldFromOffset, which has no uses.

Rename the LoadFromOffset and StoreFromOffset methods that took
Addresses to Load and Store, respectively. This makes the names
of the Assembler methods more uniform:

  * Takes an address: Load, Store, LoadField, LoadCompressedField,
    StoreIntoObject, StoreCompressedIntoObject, LoadSmi,
    LoadCompressedSmi, etc.
  * Takes a base register and an offset: LoadFromOffset, StoreToOffset,
    LoadFieldFromOffset, LoadCompressedFieldFromOffset,
    StoreIntoObjectOffset, StoreCompressedIntoObjectOffset,
    LoadSmiFromOffset, LoadCompressedSmiFromOffset, etc.

Create AssemblerBase methods for loading and storing compressed
pointers that weren't already there, as well as the corresponding
methods for loading and storing uncompressed values.

Make non-virtual methods that load and store uncompressed fields
that call the corresponding method for loading from and storing to
memory regions, adjusting the address or offset accordingly. This
avoids needing per-architecture overrides for these.

Make non-virtual methods that load compressed fields, calling the
corresponding method for loading a compressed value from a memory
region. (Since compressed pointers are only stored in Dart objects,
and stores into a Dart object may require a barrier, there is no
method for storing a compressed value into an arbitrary memory region.)

Create pure virtual methods for loading from or storing to an Address
or any method that does not have both an Address-taking and a
base register and offset pair-taking version (e.g., LoadAcquire).

Create methods for loading from or storing to a base register
and an offset. The base implementation takes the base register and
offset and creates an Address from it, then calls the Address-taking
equivalent. These methods are non-virtual when the implementation is
the same on all architectures and virtual to allow overriding when
necessary.

Make a non-virtual method for loading uncompressed Smis, since all
architectures have the same code for this, including the DEBUG check.

If compressed pointers are not being used, all the methods for
compressed pointers are non-virtual methods that call the
corresponding method for uncompressed values.

If compressed pointers are being used:

* Install pure virtual methods for loading compressed values from
  and storing compressed values to an Address or any method that does
  not have both an Address-taking and a base register and offset
  pair-taking version (e.g., LoadAcquireCompressed).

* Install virtual methods for loading compressed values from and
  storing compressed values to a base register and offset. Like the
  uncompressed implementation, the base implementation of these
  create an Address and call the Address-taking equivalent, and these
  implementations are overridden on ARM64.

* Install a non-virtual method for loading compressed Smis, since the
  only difference is that it loads a zero-extended 32-bit value, which
  AssemblerBase can do.

TEST=ci (refactoring only)

Change-Id: I934791d26a6e2cdaa6ac5f188b0fd89dbdc491d1
Cq-Include-Trybots: luci.dart.try:vm-aot-android-release-arm64c-try,vm-aot-android-release-arm_x64-try,vm-aot-linux-debug-x64-try,vm-aot-linux-debug-x64c-try,vm-aot-mac-release-arm64-try,vm-aot-mac-release-x64-try,vm-aot-obfuscate-linux-release-x64-try,vm-aot-optimization-level-linux-release-x64-try,vm-aot-win-debug-arm64-try,vm-appjit-linux-debug-x64-try,vm-asan-linux-release-x64-try,vm-checked-mac-release-arm64-try,vm-eager-optimization-linux-release-ia32-try,vm-eager-optimization-linux-release-x64-try,vm-ffi-android-debug-arm-try,vm-ffi-android-debug-arm64c-try,vm-ffi-qemu-linux-release-arm-try,vm-ffi-qemu-linux-release-riscv64-try,vm-linux-debug-ia32-try,vm-linux-debug-x64c-try,vm-mac-debug-arm64-try,vm-mac-debug-x64-try,vm-msan-linux-release-x64-try,vm-reload-linux-debug-x64-try,vm-reload-rollback-linux-debug-x64-try,vm-ubsan-linux-release-x64-try,vm-win-debug-arm64-try,vm-win-debug-x64-try,vm-win-release-ia32-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/359861
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>

https://dart.googlesource.com/sdk/+/9fc280a7f6dcaf57d9a94d663a6d62c7af1a1f90