ARM64: Fix Register and FPRegister copy constructors.

This issue was introduced in r19156.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/207743003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20212 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm64/assembler-arm64.h

@@ -115,7 +115,7 @@ struct CPURegister {
 
 struct Register : public CPURegister {
   static Register Create(unsigned code, unsigned size) {
-    return CPURegister::Create(code, size, CPURegister::kRegister);
+    return Register(CPURegister::Create(code, size, CPURegister::kRegister));
   }
 
   Register() {
@@ -124,7 +124,14 @@ struct Register : public CPURegister {
     reg_type = CPURegister::kNoRegister;
   }
 
-  Register(const CPURegister& r) {  // NOLINT(runtime/explicit)
+  explicit Register(const CPURegister& r) {
+    reg_code = r.reg_code;
+    reg_size = r.reg_size;
+    reg_type = r.reg_type;
+    ASSERT(IsValidOrNone());
+  }
+
+  Register(const Register& r) {  // NOLINT(runtime/explicit)
     reg_code = r.reg_code;
     reg_size = r.reg_size;
     reg_type = r.reg_type;
@@ -236,7 +243,8 @@ struct Register : public CPURegister {
 
 struct FPRegister : public CPURegister {
   static FPRegister Create(unsigned code, unsigned size) {
-    return CPURegister::Create(code, size, CPURegister::kFPRegister);
+    return FPRegister(
+        CPURegister::Create(code, size, CPURegister::kFPRegister));
   }
 
   FPRegister() {
@@ -245,7 +253,14 @@ struct FPRegister : public CPURegister {
     reg_type = CPURegister::kNoRegister;
   }
 
-  FPRegister(const CPURegister& r) {  // NOLINT(runtime/explicit)
+  explicit FPRegister(const CPURegister& r) {
+    reg_code = r.reg_code;
+    reg_size = r.reg_size;
+    reg_type = r.reg_type;
+    ASSERT(IsValidOrNone());
+  }
+
+  FPRegister(const FPRegister& r) {  // NOLINT(runtime/explicit)
     reg_code = r.reg_code;
     reg_size = r.reg_size;
     reg_type = r.reg_type;

src/arm64/macro-assembler-arm64.h

@@ -2216,7 +2216,7 @@ class UseScratchRegisterScope {
   FPRegister AcquireD() { return AcquireNextAvailable(availablefp_).D(); }
 
   Register UnsafeAcquire(const Register& reg) {
-    return UnsafeAcquire(available_, reg);
+    return Register(UnsafeAcquire(available_, reg));
   }
 
   Register AcquireSameSizeAs(const Register& reg);

src/arm64/stub-cache-arm64.cc

@@ -395,7 +395,7 @@ void StoreStubCompiler::GenerateStoreTransition(MacroAssembler* masm,
     __ JumpIfSmi(value_reg, miss_label);
   } else if (representation.IsDouble()) {
     UseScratchRegisterScope temps(masm);
-    Register temp_double = temps.AcquireD();
+    DoubleRegister temp_double = temps.AcquireD();
     __ SmiUntagToDouble(temp_double, value_reg, kSpeculativeUntag);
 
     Label do_store, heap_number;
@@ -546,7 +546,7 @@ void StoreStubCompiler::GenerateStoreField(MacroAssembler* masm,
     __ JumpIfSmi(value_reg, miss_label);
   } else if (representation.IsDouble()) {
     UseScratchRegisterScope temps(masm);
-    Register temp_double = temps.AcquireD();
+    DoubleRegister temp_double = temps.AcquireD();
 
     __ SmiUntagToDouble(temp_double, value_reg, kSpeculativeUntag);