[vm] Introduce FUNCTION_REG constant This refactoring introduces FUNCTION_REG constant for a register containing target function object when calling Dart functions in JIT mode. This register is similar to CODE_REG and ARGS_DESC_REG registers which are also a part of Dart calling conventions. Hardcoded registers are replaced with new constant where appropriate. Also, ARGS_DESC_REG and IC_DATA_REG are used instead of hardcoded registers in more places. TEST=ci (pure refactoring) Change-Id: I9e71022d7bca8d4e555b9e4f22558f388073495f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/243681 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
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