[vm] Introduce cachable idempotent calls
Adds a `CachableIdempotentCallInstr` that can be invoked via
`@pragma('vm:cachable-idempotent')` if the call-sites is force
optimized.
The object pool is not visited by the scavenger. So, we store the
results as unboxed integers. Consequently, only dart functions that
return integers can be cached.
Cachable idempotent calls should never be inlined. After the first
call the function not be called again.
The call itself is on a slow path to avoid register spilling on the
fast path.
TEST=vm/cc/IRTest_CachableIdempotentCall
TEST=runtime/tests/vm/dart/cachable_idempotent_test.dart
Bug: https://github.com/dart-lang/sdk/issues/51618
Change-Id: I612e896f27add76f57796c060157e14cc687a0fd
Cq-Include-Trybots: luci.dart.try:vm-aot-android-release-arm64c-try,vm-aot-android-release-arm_x64-try,vm-aot-asan-linux-release-x64-try,vm-aot-linux-debug-simarm_x64-try,vm-aot-linux-debug-simriscv64-try,vm-aot-mac-release-arm64-try,vm-aot-mac-release-x64-try,vm-aot-msan-linux-release-x64-try,vm-aot-obfuscate-linux-release-x64-try,vm-aot-tsan-linux-release-x64-try,vm-aot-ubsan-linux-release-x64-try,vm-aot-win-debug-arm64-try,vm-aot-win-debug-x64c-try,vm-aot-win-release-x64-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-kernel-linux-debug-x64-try,vm-kernel-precomp-linux-release-x64-try,vm-linux-debug-ia32-try,vm-linux-debug-simriscv64-try,vm-linux-debug-x64-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-tsan-linux-release-x64-try,vm-ubsan-linux-release-x64-try,vm-win-debug-arm64-try,vm-win-debug-x64-try,vm-win-debug-x64c-try,vm-win-release-ia32-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/301601
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
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