Fix wrong mov instruction size.

* New clang 7.0 assembler rejects mov with wrong length.

Bug: 72412103
Test: build and boot in emulator
Change-Id: If1a1affaa4a149265f8cc2b8bf463e58e71cc47a
diff --git a/libunwindstack/AsmGetRegsX86.S b/libunwindstack/AsmGetRegsX86.S
index 14927a3..021e628 100644
--- a/libunwindstack/AsmGetRegsX86.S
+++ b/libunwindstack/AsmGetRegsX86.S
@@ -50,12 +50,12 @@
   movl (%esp), %ecx
   movl %ecx, 32(%eax)
 
-  movl %cs, 36(%eax)
-  movl %ss, 40(%eax)
-  movl %ds, 44(%eax)
-  movl %es, 48(%eax)
-  movl %fs, 52(%eax)
-  movl %gs, 56(%eax)
+  mov  %cs, 36(%eax)
+  mov  %ss, 40(%eax)
+  mov  %ds, 44(%eax)
+  mov  %es, 48(%eax)
+  mov  %fs, 52(%eax)
+  mov  %gs, 56(%eax)
   ret
 
   .cfi_endproc