Changing stream conversion to use a value/op affinity analysis.
This reworks some of the prior stack to support transfer ops and analysis
to determine the placement of ops for execution and resource control.

tools/test/compile_to_phase.mlir

diff --git a/tools/test/compile_to_phase.mlir b/tools/test/compile_to_phase.mlir
index 0390564..f1861a0 100644
--- a/tools/test/compile_to_phase.mlir
+++ b/tools/test/compile_to_phase.mlir
@@ -7,36 +7,44 @@
 // ABI-PHASE: %[[INPUT:.+]] = hal.tensor.import %[[ARG0]] "input0" : !hal.buffer_view -> tensor<f32>
 // ABI-PHASE: math.absf %[[INPUT]] : tensor<f32>
 
-// RUN: iree-compile --compile-to=flow %s | FileCheck %s --check-prefix=FLOW-PHASE
+// RUN: iree-compile --compile-to=flow %s --iree-hal-target-device=local --iree-hal-local-target-device-backends=vmvx | FileCheck %s --check-prefix=FLOW-PHASE
 // FLOW-PHASE: flow.executable.export public @abs_dispatch_0
 // FLOW-PHASE: flow.dispatch @abs_dispatch_0
 
-// RUN: iree-compile --compile-to=stream %s | FileCheck %s --check-prefix=STREAM-PHASE
+// RUN: iree-compile --compile-to=flow %s | FileCheck %s --check-prefix=FLOW-PHASE-NO-DEVICE
+// FLOW-PHASE-NO-DEVICE: flow.executable.export public @abs_dispatch_0
+// FLOW-PHASE-NO-DEVICE: flow.dispatch @abs_dispatch_0
+
+// RUN: iree-compile --compile-to=stream --iree-hal-target-device=local --iree-hal-local-target-device-backends=vmvx %s | FileCheck %s --check-prefix=STREAM-PHASE
 // STREAM-PHASE: stream.executable.export public @abs_dispatch_0
 // STREAM-PHASE: stream.cmd.dispatch @abs_dispatch_0
 
-// RUN: iree-compile --compile-to=executable-sources --iree-hal-target-backends=vmvx %s | FileCheck %s --check-prefix=EXECUTABLE-SOURCES-PHASE
+// RUN: iree-compile --compile-to=stream %s | FileCheck %s --check-prefix=STREAM-PHASE-NO-DEVICE
+// STREAM-PHASE-NO-DEVICE: stream.executable.export public @abs_dispatch_0
+// STREAM-PHASE-NO-DEVICE: stream.cmd.dispatch @abs_dispatch_0
+
+// RUN: iree-compile --compile-to=executable-sources --iree-hal-target-device=local --iree-hal-local-target-device-backends=vmvx %s | FileCheck %s --check-prefix=EXECUTABLE-SOURCES-PHASE
 // EXECUTABLE-SOURCES-PHASE: hal.executable private @abs_dispatch_0
 // EXECUTABLE-SOURCES-PHASE: hal.executable.variant
 // EXECUTABLE-SOURCES-PHASE: linalg.generic
 // EXECUTABLE-SOURCES-PHASE: math.absf
 
-// RUN: iree-compile --compile-to=executable-targets --iree-hal-target-backends=vmvx %s | FileCheck %s --check-prefix=EXECUTABLE-TARGETS-PHASE
+// RUN: iree-compile --compile-to=executable-targets --iree-hal-target-device=local --iree-hal-local-target-device-backends=vmvx %s | FileCheck %s --check-prefix=EXECUTABLE-TARGETS-PHASE
 // EXECUTABLE-TARGETS-PHASE: hal.executable private @abs_dispatch_0
 // EXECUTABLE-TARGETS-PHASE: hal.executable.variant
 // EXECUTABLE-TARGETS-PHASE: vm.abs.f32
 
-// RUN: iree-compile --compile-to=hal --iree-hal-target-backends=vmvx %s | FileCheck %s --check-prefix=HAL-PHASE
+// RUN: iree-compile --compile-to=hal --iree-hal-target-device=local --iree-hal-local-target-device-backends=vmvx %s | FileCheck %s --check-prefix=HAL-PHASE
 // HAL-PHASE: hal.executable private @abs_dispatch_0
 // HAL-PHASE: hal.executable.binary
 // HAL-PHASE: hal.command_buffer.dispatch
 
-// RUN: iree-compile --compile-to=vm --iree-hal-target-backends=vmvx %s | FileCheck %s --check-prefix=VM-PHASE
+// RUN: iree-compile --compile-to=vm --iree-hal-target-device=local --iree-hal-local-target-device-backends=vmvx %s | FileCheck %s --check-prefix=VM-PHASE
 // VM-PHASE: vm.rodata private @abs_dispatch_0
 // VM-PHASE: vm.call @hal.command_buffer.dispatch
 
-// RUN: iree-compile --output-format=vm-asm --compile-to=end --iree-hal-target-backends=vmvx %s | FileCheck %s --check-prefix=END-PHASE
-// RUN: iree-compile --output-format=vm-asm --iree-hal-target-backends=vmvx %s | FileCheck %s --check-prefix=END-PHASE
+// RUN: iree-compile --output-format=vm-asm --compile-to=end --iree-hal-target-device=local --iree-hal-local-target-device-backends=vmvx %s | FileCheck %s --check-prefix=END-PHASE
+// RUN: iree-compile --output-format=vm-asm --iree-hal-target-device=local --iree-hal-local-target-device-backends=vmvx %s | FileCheck %s --check-prefix=END-PHASE
 // END-PHASE: vm.rodata private @abs_dispatch_0
 // END-PHASE: vm.call @hal.command_buffer.dispatch