Add VAND to the integrated ARM assembler.

BUG= https://bugs.chromium.org/p/nativeclient/issues/detail?id=4334
R=jpp@chromium.org, stichnot@chromium.org

Review URL: https://codereview.chromium.org/1657353002 .
diff --git a/src/IceTargetLoweringARM32.cpp b/src/IceTargetLoweringARM32.cpp
index f284f4d..7a19f11 100644
--- a/src/IceTargetLoweringARM32.cpp
+++ b/src/IceTargetLoweringARM32.cpp
@@ -2962,6 +2962,7 @@
         return;
       }
     }
+    assert(isIntegerType(DestTy));
     Variable *Src0R = Srcs.src0R(this);
     if (isVectorType(DestTy)) {
       Variable *Src1R = legalizeToReg(Src1);