[turbofan] Remove architecture-specific linkage files and LinkageTraits. Use macro-assembler-define…

src/ppc/assembler-ppc.h

Index: src/ppc/assembler-ppc.h
diff --git a/src/ppc/assembler-ppc.h b/src/ppc/assembler-ppc.h
index 2de8ae267f3981be64d5c0fe7adeefa005455691..a1c08ad0ea34a7c8336e6139b8df3f317a64b134 100644
--- a/src/ppc/assembler-ppc.h
+++ b/src/ppc/assembler-ppc.h
@@ -292,15 +292,6 @@ const Register fp = {kRegister_fp_Code};
 const Register cp = {kRegister_r30_Code};  // JavaScript context pointer
 const Register kRootRegister = {kRegister_r29_Code};  // Roots array pointer.
 const Register kConstantPoolRegister = {kRegister_r28_Code};  // Constant pool
-const Register kInterpreterBytecodeOffsetRegister = {
-    kRegister_r14_Code  // Interpreter bytecode offset.
-};
-const Register kInterpreterBytecodeArrayRegister = {
-    kRegister_r15_Code  // Interpreter bytecode array pointer.
-};
-const Register kInterpreterDispatchTableRegister = {
-    kRegister_r16_Code  // Interpreter dispatch table.
-};
 
 // Double word FP register.
 struct DoubleRegister {