Fix clang warnings

Explicitly convert unsigned int to uint64_t before converting them to
uint16x4_t or uint8x8_t.

BUG=chromium:1035559

Change-Id: I7d0084c1ab9393063a15972a714d89db4e5e1afe
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/260981
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

Author: jcai19

src/opts/SkBitmapProcState_opts.h

@@ -428,7 +428,7 @@ static void decode_packed_coordinates_and_weight(U32 packed, Out* v0, Out* v1, O
                 tmp = vmul_u16(tmp, vscale);       // multiply result by scale
             }
 
-            vres = vshrn_n_u16(vcombine_u16(tmp, vcreate_u16(0)), 8); // shift down result by 8
+            vres = vshrn_n_u16(vcombine_u16(tmp, vcreate_u16((uint64_t)0)), 8); // shift down result by 8
             vst1_lane_u32(dst, vreinterpret_u32_u8(vres), 0);         // store result
         }
     #else

src/opts/SkBlitRow_opts.h

@@ -354,7 +354,7 @@ void blit_row_s32a_opaque(SkPMColor* dst, const SkPMColor* src, int len, U8CPU a
     }
 
     if (len != 0) {
-        uint8x8_t result = SkPMSrcOver_neon2(vcreate_u8(*dst), vcreate_u8(*src));
+        uint8x8_t result = SkPMSrcOver_neon2(vcreate_u8((uint64_t)*dst), vcreate_u8((uint64_t)*src));
         vst1_lane_u32(dst, vreinterpret_u32_u8(result), 0);
     }
     return;