When generating code for deferred units compiler
can't emit PC relative call to the shared Mint allocation
stub. This causes compiler to emit an indirect call
through a Code object. Such calls clobber CODE_REG
which is actually an allocatable register.
Fix this by using non-allocatable register instead of
CODE_REG when generating indirect calls through
Code object in AOT mode. Callees don't expect
anything useful in CODE_REG anyway because AOT
calling convetion does not use it.
TEST=vm/cc/{BranchLinkPreservesRegisters,JumpAndLinkPreservesRegisters,CallCodePreservesRegisters}
Bug: b/242559057
Cq-Include-Trybots: luci.dart.try:vm-aot-linux-release-arm64-try,vm-aot-linux-release-simarm_x64-try,vm-aot-linux-release-x64-try,vm-aot-linux-product-x64-try,vm-aot-obfuscate-linux-release-x64-try,vm-aot-optimization-level-linux-release-x64-try,vm-aot-linux-debug-simriscv64-try,vm-ffi-qemu-linux-release-riscv64-try
Change-Id: Ib1fdc1c104d0269d41bb1ab9cbe292ad28c7cd49
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/338127
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Slava Egorov <vegorov@google.com>
Vyacheslav Egorov
dcac60b672