[arm] Simplify run-time CPU selection.

src/globals.h

 // Copyright 2012 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.
 
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 714 matching lines @@
   SSE3,
   SAHF,
   AVX,
   FMA3,
   BMI1,
   BMI2,
   LZCNT,
   POPCNT,
   ATOM,
   // ARM
-  VFP3,
-  ARMv7,
-  ARMv8,
-  SUDIV,
+  // - Standard configurations. The baseline is ARMv6+VFPv2.
+  ARMv7,        // ARMv7-A + VFPv3-D32 + NEON
+  ARMv7_SUDIV,  // ARMv7-A + VFPv4-D32 + NEON + SUDIV
+  ARMv8,        // ARMv8-A (+ all of the above)
+  // - Additional tuning flags.
   MOVW_MOVT_IMMEDIATE_LOADS,
-  VFP32DREGS,
-  NEON,
   // MIPS, MIPS64
   FPU,
   FP64FPU,
   MIPSr1,
   MIPSr2,
   MIPSr6,
   // ARM64
   ALWAYS_ALIGN_CSP,
   // PPC
   FPR_GPR_MOV,
   LWSYNC,
   ISELECT,
   // S390
   DISTINCT_OPS,
   GENERAL_INSTR_EXT,
   FLOATING_POINT_EXT,
   // PPC/S390
   UNALIGNED_ACCESSES,
 
-  NUMBER_OF_CPU_FEATURES
+  NUMBER_OF_CPU_FEATURES,
+
+  // ARM feature aliases (based on the standard configurations above).
+  VFP3 = ARMv7,
+  NEON = ARMv7,
+  VFP32DREGS = ARMv7,
+  SUDIV = ARMv7_SUDIV
 };
 
 // Defines hints about receiver values based on structural knowledge.
 enum class ConvertReceiverMode : unsigned {
   kNullOrUndefined,     // Guaranteed to be null or undefined.
   kNotNullOrUndefined,  // Guaranteed to never be null or undefined.
   kAny                  // No specific knowledge about receiver.
 };
 
 inline size_t hash_value(ConvertReceiverMode mode) {
@@ skipping 383 matching lines @@
  public:
   enum { kNone = 0x00, kSignedSmall = 0x01, kNumber = 0x3, kAny = 0x7 };
 };
 
 }  // namespace internal
 }  // namespace v8
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_