ART: Make InstructionSet an enum class and add kLast.

Adding InstructionSet::kLast shall make it easier to encode
the InstructionSet in fewer bits using BitField<>. However,
introducing `kLast` into the `art` namespace is not a good
idea, so we change the InstructionSet to an enum class.
This also uncovered a case of InstructionSet::kNone being
erroneously used instead of vixl32::Condition::None(), so
it's good to remove `kNone` from the `art` namespace.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Change-Id: I6fa6168dfba4ed6da86d021a69c80224f09997a6

1 files changed, 7 insertions, 7 deletions

diff --git a/compiler/optimizing/code_generator.cc b/compiler/optimizing/code_generator.cc
index b8d1f52995..5625f04726 100644
--- a/compiler/optimizing/code_generator.cc
+++ b/compiler/optimizing/code_generator.cc
@@ -786,43 +786,43 @@ std::unique_ptr<CodeGenerator> CodeGenerator::Create(HGraph* graph,
   ArenaAllocator* allocator = graph->GetAllocator();
   switch (instruction_set) {
 #ifdef ART_ENABLE_CODEGEN_arm
-    case kArm:
-    case kThumb2: {
+    case InstructionSet::kArm:
+    case InstructionSet::kThumb2: {
       return std::unique_ptr<CodeGenerator>(
           new (allocator) arm::CodeGeneratorARMVIXL(
               graph, *isa_features.AsArmInstructionSetFeatures(), compiler_options, stats));
     }
 #endif
 #ifdef ART_ENABLE_CODEGEN_arm64
-    case kArm64: {
+    case InstructionSet::kArm64: {
       return std::unique_ptr<CodeGenerator>(
           new (allocator) arm64::CodeGeneratorARM64(
               graph, *isa_features.AsArm64InstructionSetFeatures(), compiler_options, stats));
     }
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips
-    case kMips: {
+    case InstructionSet::kMips: {
       return std::unique_ptr<CodeGenerator>(
           new (allocator) mips::CodeGeneratorMIPS(
               graph, *isa_features.AsMipsInstructionSetFeatures(), compiler_options, stats));
     }
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips64
-    case kMips64: {
+    case InstructionSet::kMips64: {
       return std::unique_ptr<CodeGenerator>(
           new (allocator) mips64::CodeGeneratorMIPS64(
               graph, *isa_features.AsMips64InstructionSetFeatures(), compiler_options, stats));
     }
 #endif
 #ifdef ART_ENABLE_CODEGEN_x86
-    case kX86: {
+    case InstructionSet::kX86: {
       return std::unique_ptr<CodeGenerator>(
           new (allocator) x86::CodeGeneratorX86(
               graph, *isa_features.AsX86InstructionSetFeatures(), compiler_options, stats));
     }
 #endif
 #ifdef ART_ENABLE_CODEGEN_x86_64
-    case kX86_64: {
+    case InstructionSet::kX86_64: {
       return std::unique_ptr<CodeGenerator>(
           new (allocator) x86_64::CodeGeneratorX86_64(
               graph, *isa_features.AsX86_64InstructionSetFeatures(), compiler_options, stats));