move comment above in test file

Signed-off-by: Nathan Gauër <[email protected]>

Author: Keenuts

llvm/test/MachineVerifier/SPIRV/verifier-phi-duplicate-pred.mir

@@ -2,6 +2,9 @@
 # REQUIRES: spirv-registered-target
 
 # This should cleanly pass the machine verifier.
+# This test validates a subtle SPIR-V difference with PHI nodes:
+# It is valid to have the same predecessor present twice in the instruction,
+# as long as the associated value is the same.
 ---
 # CHECK-LABEL: name: func0
 # CHECK: %7:id = OpPhi %1, %5, %bb.1, %6, %bb.2
@@ -26,9 +29,6 @@ body: |
     OpBranch %bb.3
 
   bb.3:
-# This test validates a subtle SPIR-V difference with PHI nodes:
-# It is valid to have the same predecessor present twice in the instruction,
-# as long as the associated value is the same.
     %7:id = OpPhi %1, %5, %bb.1, %6, %bb.2, %5, %bb.1
 ...
 ---