RFR: 9+8u: Fix build error in MacroAssembler::needs_explicit_null_check

[Roman Kennke]

Am 20.03.2017 um 17:51 schrieb Aleksey Shipilev:
> i586 build fails with:
>
> jdk8u/hotspot/src/share/vm/asm/assembler.cpp:323: error: integer constant is too
> large for ‘unsigned long’ type
> jdk8u/hotspot/src/share/vm/asm/assembler.cpp: In static member function ‘static
> bool MacroAssembler::needs_explicit_null_check(intptr_t)’:
> jdk8u/hotspot/src/share/vm/asm/assembler.cpp:323: error: large integer
> implicitly truncated to unsigned type
>
> Fix:
>   http://cr.openjdk.java.net/~shade/shenandoah/build/masm-null-check/webrev.01/
>
> This affects both 9 and 8u.
>
> Testing: hotspot_gc_shenandoah/fastdebug with 9 and 8u
>
> Thanks,
> -Aleksey
>
Looks good!