cmd/internal: support -buildmode=c-shared on linux/mips64le

For golang#43264

Signed-off-by: Xiaodong Liu <liuxiaodong@loongson.cn>

src/cmd/internal/obj/mips/a.out.go

@@ -301,16 +301,27 @@ const (
 	C_STCON /* $tlsvar */
 	C_SBRA
 	C_LBRA
+	C_LOBRA  /* PIC call or jump to offset */
+	C_SYMBRA /* PIC call or jump to GOT sym */
 	C_SAUTO
 	C_LAUTO
 	C_SEXT
 	C_LEXT
 	C_ZOREG
+	C_SHZOREG /* PIC call to register without offset */
 	C_SOREG
 	C_LOREG
 	C_GOK
 	C_ADDR
-	C_TLS
+	C_GOTADDR /* for GOT sym  */
+	C_GOTREF
+
+	// TLS "var" in local exec mode: will become a constant offset from
+	// thread local base that is ultimately chosen by the program linker.
+	C_TLS_LE
+
+	C_TLS_GD
+
 	C_TEXTSIZE
 
 	C_NCLASS /* must be the last */

src/cmd/internal/obj/mips/anames0.go

@@ -30,16 +30,22 @@ var cnames0 = []string{
 	"STCON",
 	"SBRA",
 	"LBRA",
+	"LOBRA",
+	"SYMBRA",
 	"SAUTO",
 	"LAUTO",
 	"SEXT",
 	"LEXT",
 	"ZOREG",
+	"SHZOREG",
 	"SOREG",
 	"LOREG",
 	"GOK",
 	"ADDR",
-	"TLS",
+	"GOTADDR",
+	"GOTREF",
+	"TLS_LE",
+	"TLS_GD",
 	"TEXTSIZE",
 	"NCLASS",
 }