RISC-V: Define __riscv_v_intrinsic [PR109312]

RVV intrinsic has defined a macro to identity the version of RVV
intrinsic spec, we missed that before, thanksful we are catch this
before release.

gcc/ChangeLog:

	PR target/109312
	* config/riscv/riscv-c.cc (riscv_ext_version_value): New.
	(riscv_cpu_cpp_builtins): Define __riscv_v_intrinsic and
	minor refactor.

gcc/testsuite/ChangeLog:

	PR target/109312
	* gcc.target/riscv/predef-__riscv_v_intrinsic.c: New test.

1 files changed, 11 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.target/riscv/predef-__riscv_v_intrinsic.c b/gcc/testsuite/gcc.target/riscv/predef-__riscv_v_intrinsic.c
new file mode 100644
index 0000000..dbbedf5
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/predef-__riscv_v_intrinsic.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64imafdcv -mabi=lp64d" } */
+
+int main () {
+
+#if __riscv_v_intrinsic != 11000
+#error "__riscv_v_intrinsic"
+#endif
+
+  return 0;
+}