typo fix

mozilla-release/patches/1430161-60a1.patch

@@ -504,7 +504,7 @@ diff --git a/js/src/jit/arm/Assembler-arm.cpp b/js/src/jit/arm/Assembler-arm.cpp
          as_b(off, c, ret);
  #ifdef JS_DISASM_ARM
 -        spewBranch(m_buffer.getInstOrNull(ret), l);
-+        pewBranch(m_buffer.getInstOrNull(ret), refLabel(l));
++        spewBranch(m_buffer.getInstOrNull(ret), refLabel(l));
  #endif
          return ret;
      }