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

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
diff --git a/src/mips/macro-assembler-mips.h b/src/mips/macro-assembler-mips.h
index cbc17d45ed9228e99036c195dd7aefb45f843cea..ee9ffe796238dd47137f5d2c406d02938dfd5fcb 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.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 = {Register::kCpRegister};
+const Register kInterpreterBytecodeOffsetRegister = {kRegister_t4_Code};
+const Register kInterpreterBytecodeArrayRegister = {kRegister_t5_Code};
+const Register kInterpreterDispatchTableRegister = {kRegister_t6_Code};
+const Register kRuntimeCallFunctionRegister = {kRegister_a1_Code};
+const Register kRuntimeCallArgCountRegister = {kRegister_a0_Code};
+
 // Forward declaration.
 class JumpTarget;