[PATCH i-g-t] tests/amdgpu: insert pause mnemonic only on x86 / x86_64 platforms

[Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>]

The "pause" assembly mnemonic is only available on IA-32 platforms,
breaking e.g. debug IGT builds on ARM / AArch64. The issue manifests
only with -O1 or -O0, the default -O2 seems to optimize the condition
away.

Guard this inline assembly with the preprocessor checks, making sure
that other platforms don't see the invalid assembly.

FAILED: [code=1] tests/amdgpu/amd_basic.p/amd_basic.c.o
Assembler messages:
{standard input}:3702: Error: unknown mnemonic `pause' -- `pause'

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 tests/amdgpu/amd_basic.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/amdgpu/amd_basic.c b/tests/amdgpu/amd_basic.c
index 418db286f81f..494934c1c321 100644
--- a/tests/amdgpu/amd_basic.c
+++ b/tests/amdgpu/amd_basic.c
@@ -705,8 +705,10 @@ static int wait_for_value64(volatile uint64_t *ptr, uint64_t expected,
 		/* Sleep if interval specified, otherwise tight loop */
 		if (check_interval_ns > 0)
 			nanosleep(&sleep_time, NULL);
+#if defined(x86_64) || defined(i386)
 		else
 			__asm__ __volatile__("pause" ::: "memory"); /* CPU hint for spin-wait */
+#endif
 	}
 }
 
-- 
2.53.0