RISC-V: Fix -march error of zhinxmin testcases

This little patch fixs the -march error of a zhinxmin testcase I added earlier
and an old zhinxmin testcase, since these testcases are for zhinxmin extension
and not zfhmin extension.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/_Float16-zhinxmin-3.c: Adjust.
	* gcc.target/riscv/_Float16-zhinxmin-4.c: Ditto.

gcc/testsuite/gcc.target/riscv/_Float16-zhinxmin-3.c

 /* { dg-do compile } */
-/* { dg-options "-march=rv64if_zfhmin -mabi=lp64f -O" } */
+/* { dg-options "-march=rv64i_zhinxmin -mabi=lp64 -O" } */
 
 int foo1 (_Float16 a, _Float16 b)
 {

gcc/testsuite/gcc.target/riscv/_Float16-zhinxmin-4.c

 /* { dg-do compile } */
-/* { dg-options "-march=rv64if_zfhmin -mabi=lp64 -O3 -mcmodel=medany" } */
+/* { dg-options "-march=rv64i_zhinxmin -mabi=lp64 -O3 -mcmodel=medany" } */
 /* { dg-final { check-function-bodies "**" "" } } */
 
 /* Make sure zfhmin behaves the same way as zfh. */
 /*
 ** foo: { target { no-opts "-flto" } }
-**   lh\ta0,\.LC0
+**   lla\ta[0-9]+,\.LC0
+**   lhu\ta[0-9]+,0\(a[0-9]+\)
 **   ...
 */
 _Float16 foo() { return 0.8974; }