aarch64: vp9 16bpp: Fix assembling with Xcode 6.2 and older

Properly use the b.eq form instead of the nonstandard form (which
both gas and newer clang accept though), and expand the register
lists that used a range (which the Xcode 6.2 clang, based on clang
3.5 svn, didn't support).
Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/aarch64/vp9itxfm_16bpp_neon.S

@@ -1925,8 +1925,8 @@ function vp9_idct_idct_32x32_add_16_neon
 2:
         subs            x1,  x1,  #1
 .rept 4
-        st1             {v16.4s-v19.4s},  [x0], #64
-        st1             {v16.4s-v19.4s},  [x0], #64
+        st1             {v16.4s,v17.4s,v18.4s,v19.4s},  [x0], #64
+        st1             {v16.4s,v17.4s,v18.4s,v19.4s},  [x0], #64
 .endr
         b.ne            2b
 3:
@@ -1991,8 +1991,8 @@ function idct32x32_\size\()_add_16_neon
         movi            v19.4s,  #0
 
 .rept 4
-        st1             {v16.4s-v19.4s},  [x0], #64
-        st1             {v16.4s-v19.4s},  [x0], #64
+        st1             {v16.4s,v17.4s,v18.4s,v19.4s},  [x0], #64
+        st1             {v16.4s,v17.4s,v18.4s,v19.4s},  [x0], #64
 .endr
 
 3:

libavcodec/aarch64/vp9mc_16bpp_neon.S

@@ -275,7 +275,7 @@ function \type\()_8tap_\size\()h
         subs            x9,  x9,  #32
         st1             {v1.8h,  v2.8h},  [x0], #32
         st1             {v24.8h, v25.8h}, [x6], #32
-        beq             3f
+        b.eq            3f
         mov             v5.16b,  v7.16b
         mov             v16.16b, v18.16b
         ld1             {v6.8h,  v7.8h},  [x2], #32