RISC-V: Test cases for complex CSR checking

This commit tests whether the miselect CSR is unlocked by either
'Smaia' or 'Smcsrind' extension.

gas/ChangeLog:

	* testsuite/gas/riscv/csr-complex.s: New test.
	* testsuite/gas/riscv/csr-complex-1.d: Likewise.
	* testsuite/gas/riscv/csr-complex-1.l: Likewise.
	* testsuite/gas/riscv/csr-complex-2.d: Likewise.
	* testsuite/gas/riscv/csr-complex-3.d: Likewise.

Author: a4lg

gas/testsuite/gas/riscv/csr-complex-1.d

@@ -0,0 +1,12 @@
+#as: -march=rv64i_zicsr -mcsr-check
+#source: csr-complex.s
+#warning_output: csr-complex-1.l
+#objdump: -d
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ 	]+[0-9a-f]+:[ 	]+35002573[ 	]+csrr[ 	]+a0,miselect

gas/testsuite/gas/riscv/csr-complex-1.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*Warning: invalid CSR `miselect', needs `smaia' or `smcsrind' extension

gas/testsuite/gas/riscv/csr-complex-2.d

@@ -0,0 +1,11 @@
+#as: -march=rv64i_zicsr_smaia -mcsr-check
+#source: csr-complex.s
+#objdump: -d
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ 	]+[0-9a-f]+:[ 	]+35002573[ 	]+csrr[ 	]+a0,miselect

gas/testsuite/gas/riscv/csr-complex-3.d

@@ -0,0 +1,11 @@
+#as: -march=rv64i_zicsr_smcsrind -mcsr-check
+#source: csr-complex.s
+#objdump: -d
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ 	]+[0-9a-f]+:[ 	]+35002573[ 	]+csrr[ 	]+a0,miselect

gas/testsuite/gas/riscv/csr-complex.s

@@ -0,0 +1,2 @@
+target:
+	csrr	a0, miselect