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

src/mips64/macro-assembler-mips64.h

Index: src/mips64/macro-assembler-mips64.h
diff --git a/src/mips64/macro-assembler-mips64.h b/src/mips64/macro-assembler-mips64.h
index 806a5475a924e95a6489712aa88f23e328efbfa5..f45b1b0169cb1b080e0db71bdf9b82dfbf390e68 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -12,6 +12,17 @@
 namespace v8 {
 namespace internal {
 
+// Give alias names to registers for calling conventions.
+const Register kReturnRegister0 = {kRegister_v0_Code};
+const Register kReturnRegister1 = {kRegister_v1_Code};
+const Register kJSFunctionRegister = {kRegister_a1_Code};
+const Register kContextRegister = {kRegister_s7_Code};
+const Register kInterpreterBytecodeOffsetRegister = {kRegister_t0_Code};
+const Register kInterpreterBytecodeArrayRegister = {kRegister_t1_Code};
+const Register kInterpreterDispatchTableRegister = {kRegister_t2_Code};
+const Register kRuntimeCallFunctionRegister = {kRegister_a1_Code};
+const Register kRuntimeCallArgCountRegister = {kRegister_a0_Code};
+
 // Forward declaration.
 class JumpTarget;