RISC-V/testsuite: constraint some of tests to hard_float

Commit 9ddd44b586 ("RISC-V: Provide `fmin'/`fmax' RTL pattern") added
tests which check for hard float instructions which obviously fails on
soft-float ABI builds.

And my recent commit b646d7d279 ("RISC-V: Inhibit FP <--> int register
moves via tune param") is guilty of same crime.

So constraint with "dg-require-effective-target hard_float"

This reduces bunch of new RV failures.

|               ========= Summary of gcc testsuite =========
|                            | # of unexpected case / # of unique unexpected case
|                            |          gcc |          g++ |     gfortran |
|   rv64imac/   lp64/ medlow |  134 /    22 |    0 /     0 |            - |  BEFORE
|   rv64imac/   lp64/ medlow |   22 /     9 |    0 /     0 |            - |  AFTER
|

gcc/testsuite/Changelog:
	* gcc.target/riscv/fmax.c: Add dg-require-effective-target hard_float.
	* gcc.target/riscv/fmaxf.c: Ditto.
	* gcc.target/riscv/fmin.c: Ditto.
	* gcc.target/riscv/fminf.c: Ditto.
	* gcc.target/riscv/smax-ieee.c: Ditto.
	* gcc.target/riscv/smax.c: Ditto.
	* gcc.target/riscv/smaxf-ieee.c: Ditto.
	* gcc.target/riscv/smaxf.c: Ditto.
	* gcc.target/riscv/smin-ieee.c: Ditto.
	* gcc.target/riscv/smin.c: Ditto.
	* gcc.target/riscv/sminf-ieee.c: Ditto.
	* gcc.target/riscv/sminf.c: Ditto.
	* gcc.target/riscv/pr105666.c: Ditto.

Signed-off-by: Vineet Gupta <vineetg@rivosinc.com>

gcc/testsuite/gcc.target/riscv/fmax.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-fno-finite-math-only -fsigned-zeros -fno-signaling-nans -dp" } */
 
 double

gcc/testsuite/gcc.target/riscv/fmaxf.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-fno-finite-math-only -fsigned-zeros -fno-signaling-nans -dp" } */
 
 float

gcc/testsuite/gcc.target/riscv/fmin.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-fno-finite-math-only -fsigned-zeros -fno-signaling-nans -dp" } */
 
 double

gcc/testsuite/gcc.target/riscv/fminf.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-fno-finite-math-only -fsigned-zeros -fno-signaling-nans -dp" } */
 
 float

gcc/testsuite/gcc.target/riscv/pr105666.c

@@ -6,6 +6,7 @@
    spilling to stack.  */
 
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-march=rv64g -ffast-math" } */
 
 #define NITER 4

gcc/testsuite/gcc.target/riscv/smax-ieee.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-ffinite-math-only -fsigned-zeros -dp" } */
 
 double

gcc/testsuite/gcc.target/riscv/smax.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-ffinite-math-only -fno-signed-zeros -dp" } */
 
 double

gcc/testsuite/gcc.target/riscv/smaxf-ieee.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-ffinite-math-only -fsigned-zeros -dp" } */
 
 float

gcc/testsuite/gcc.target/riscv/smaxf.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-ffinite-math-only -fno-signed-zeros -dp" } */
 
 float

gcc/testsuite/gcc.target/riscv/smin-ieee.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-ffinite-math-only -fsigned-zeros -dp" } */
 
 double

gcc/testsuite/gcc.target/riscv/smin.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-ffinite-math-only -fno-signed-zeros -dp" } */
 
 double

gcc/testsuite/gcc.target/riscv/sminf-ieee.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-ffinite-math-only -fsigned-zeros -dp" } */
 
 float

gcc/testsuite/gcc.target/riscv/sminf.c

@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
 /* { dg-options "-ffinite-math-only -fno-signed-zeros -dp" } */
 
 float