AMDGPU: Set isTrap on S_TRAP

This seems to only be used for generating some kind
of documentation, but might as well set it.

llvm-svn: 363454

Author: arsenm

llvm/lib/Target/AMDGPU/SOPInstructions.td

@@ -1072,7 +1072,10 @@ def S_SENDMSGHALT : SOPP <0x00000011, (ins SendMsgImm:$simm16), "s_sendmsghalt $
 >;
 } // End Uses = [EXEC, M0]
 
-def S_TRAP : SOPP <0x00000012, (ins i16imm:$simm16), "s_trap $simm16">;
+def S_TRAP : SOPP <0x00000012, (ins i16imm:$simm16), "s_trap $simm16"> {
+  let isTrap = 1;
+}
+
 def S_ICACHE_INV : SOPP <0x00000013, (ins), "s_icache_inv"> {
   let simm16 = 0;
 }