[Turbofan] Add concept of FP register aliasing on ARM 32.

test/unittests/BUILD.gn

 # Copyright 2016 The V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("../../gni/v8.gni")
 
 v8_executable("unittests") {
   testonly = true
 
   sources = [
@@ skipping 32 matching lines @@
     "compiler/escape-analysis-unittest.cc",
     "compiler/graph-reducer-unittest.cc",
     "compiler/graph-reducer-unittest.h",
     "compiler/graph-trimmer-unittest.cc",
     "compiler/graph-unittest.cc",
     "compiler/graph-unittest.h",
     "compiler/instruction-selector-unittest.cc",
     "compiler/instruction-selector-unittest.h",
     "compiler/instruction-sequence-unittest.cc",
     "compiler/instruction-sequence-unittest.h",
+    "compiler/instruction-unittest.cc",
     "compiler/int64-lowering-unittest.cc",
     "compiler/js-builtin-reducer-unittest.cc",
     "compiler/js-create-lowering-unittest.cc",
     "compiler/js-intrinsic-lowering-unittest.cc",
     "compiler/js-operator-unittest.cc",
     "compiler/js-typed-lowering-unittest.cc",
     "compiler/linkage-tail-call-unittest.cc",
     "compiler/live-range-builder.h",
     "compiler/live-range-unittest.cc",
     "compiler/liveness-analyzer-unittest.cc",
@@ skipping 107 matching lines @@
     "//testing/gtest",
   ]
 
   if (is_win) {
     # This warning is benignly triggered by the U16 and U32 macros in
     # bytecode-utils.h.
     # C4309: 'static_cast': truncation of constant value
     cflags = [ "/wd4309" ]
   }
 }