[9] RFR(XS): 8031389: On x86 C1 emits two relocations for polls

[Tobias Hartmann]

Hi,

please review the following patch for 8031389.

*Problem*
C1 emits two poll_type relocations at safepoint polls because 
LIR_Assembler::safepoint_poll(..) adds a relocation and calls 
LIR_Assembler::add_debug_info_for_branch(..) which adds a relocation as 
well.

Bug: https://bugs.openjdk.java.net/browse/JDK-8031389

*Solution*
The implementation of add_debug_info_for_branch(..) is changed to not 
emit a poll relocation. This also improves the semantics because the 
method is used for normal branches as well (see 
LIR_Assembler::emit_opBranch(..)).

The implementation of LIR_Assembler::safepoint_poll(...) for sparc, arm 
and ppc is changed to always emit a poll relocation.

Webrev: http://cr.openjdk.java.net/~thartmann/8031389/webrev.00/

*Tests*
JPRT

Thanks,
Tobias
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