A64: Rename k<Y>RegSize to k<Y>RegSizeInBits, and k<Y>RegSizeInBytes to k<Y>RegSize.

src/a64/code-stubs-a64.h

Index: src/a64/code-stubs-a64.h
diff --git a/src/a64/code-stubs-a64.h b/src/a64/code-stubs-a64.h
index c3a2c0f18565423aa72b2d2a912e245dcd893b0b..6e79fb9bd4dd8c7fc3941822db3489c2b09ec099 100644
--- a/src/a64/code-stubs-a64.h
+++ b/src/a64/code-stubs-a64.h
@@ -262,7 +262,7 @@ class RecordWriteStub: public PlatformCodeStub {
       //  - x29 frame pointer
       //  - x30 link register(lr)
       //  - x31 xzr/stack pointer
-      CPURegList list(CPURegister::kRegister, kXRegSize, 0, 25);
+      CPURegList list(CPURegister::kRegister, kXRegSizeInBits, 0, 25);
 
       // We also remove MacroAssembler's scratch registers.
       list.Remove(ip0);