[HIP][Clang][Driver] Correctly specify test requirements as Linux + x86 + AMDGPU; temporarily retain targeted XFAILs for Hexagon & PS.

Differential Revision: https://reviews.llvm.org/D155775

Author: AlexVlx

clang/test/Driver/hipstdpar.c

@@ -1,8 +1,9 @@
-// XFAIL: target={{.*}}-apple{{.*}}
+// REQUIRES: x86-registered-target
+// REQUIRES: amdgpu-registered-target
+// REQUIRES: system-linux
 // XFAIL: target={{.*}}hexagon{{.*}}
 // XFAIL: target={{.*}}-scei{{.*}}
 // XFAIL: target={{.*}}-sie{{.*}}
-// XFAIL: target={{.*}}-windows{{.*}}
 
 // RUN: not %clang -### --hipstdpar -nogpulib -nogpuinc --compile %s 2>&1 | \
 // RUN:   FileCheck --check-prefix=HIPSTDPAR-MISSING-LIB %s