RISC-V/testsuite: Fix ILP32 RVV failures from missing <gnu/stubs-ilp32d.h>

In non-multilib installations system headers may not be available for
compilation options using a non-default model, causing build errors such
as:

In file included from .../include/features.h:527,
                 from .../include/assert.h:35,
                 from .../gcc/testsuite/gcc.target/riscv/rvv/autovec/vmv-imm-template.h:2,
                 from .../gcc/testsuite/gcc.target/riscv/rvv/autovec/vmv-imm-fixed-rv32.c:4:
.../include/gnu/stubs.h:11:11: fatal error: gnu/stubs-ilp32d.h: No such file or directory

Therefore we have to be very cautious when trying to use a non-default
model in the testsuite, preferably avoiding to rely on headers that have
not been supplied by GCC itself, or otherwise verifying in a preparatory
step whether the given model is buildable in a given test environment.

In this case however we can easily avoid the issue, because <assert.h>
facilities are not used at all by "vmv-imm-template.h", which includes
the header.  Remove the inclusion then, turning these issues:

FAIL: gcc.target/riscv/rvv/autovec/vmv-imm-fixed-rv32.c -O3 -ftree-vectorize (test for excess errors)
UNRESOLVED: gcc.target/riscv/rvv/autovec/vmv-imm-fixed-rv32.c -O3 -ftree-vectorize  scan-assembler-times vmv.v.i 32
UNRESOLVED: gcc.target/riscv/rvv/autovec/vmv-imm-fixed-rv32.c -O3 -ftree-vectorize  scan-assembler-times vmv.v.x 8
FAIL: gcc.target/riscv/rvv/autovec/vmv-imm-rv32.c -O3 -ftree-vectorize (test for excess errors)
UNRESOLVED: gcc.target/riscv/rvv/autovec/vmv-imm-rv32.c -O3 -ftree-vectorize  scan-assembler-times vmv.v.i 32
UNRESOLVED: gcc.target/riscv/rvv/autovec/vmv-imm-rv32.c -O3 -ftree-vectorize  scan-assembler-times vmv.v.x 8

into successful results:

PASS: gcc.target/riscv/rvv/autovec/vmv-imm-fixed-rv32.c -O3 -ftree-vectorize (test for excess errors)
PASS: gcc.target/riscv/rvv/autovec/vmv-imm-fixed-rv32.c -O3 -ftree-vectorize  scan-assembler-times vmv.v.i 32
PASS: gcc.target/riscv/rvv/autovec/vmv-imm-fixed-rv32.c -O3 -ftree-vectorize  scan-assembler-times vmv.v.x 8
PASS: gcc.target/riscv/rvv/autovec/vmv-imm-rv32.c -O3 -ftree-vectorize (test for excess errors)
PASS: gcc.target/riscv/rvv/autovec/vmv-imm-rv32.c -O3 -ftree-vectorize  scan-assembler-times vmv.v.i 32
PASS: gcc.target/riscv/rvv/autovec/vmv-imm-rv32.c -O3 -ftree-vectorize  scan-assembler-times vmv.v.x 8

in a plain LP64 `riscv64-linux-gnu' configuration.

	gcc/testsuite/
	* gcc.target/riscv/rvv/autovec/vmv-imm-template.h: Remove
	<assert.h> inclusion.

1 files changed, 0 insertions, 1 deletions

diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vmv-imm-template.h b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vmv-imm-template.h
index 84b26e0..35e60c0 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vmv-imm-template.h
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vmv-imm-template.h
@@ -1,5 +1,4 @@
 #include <stdint-gcc.h>
-#include <assert.h>
 
 #define VMV_POS(TYPE,VAL)				\
   __attribute__ ((noipa))                               \