[GHC] #15104: Update JMP_TBL targets during shortcutting for x86 codegen.

[GHC]

#15104: Update JMP_TBL targets during shortcutting for x86 codegen.
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        Reporter:  AndreasK          |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler (NCG)    |              Version:  8.5
      Resolution:                    |             Keywords:  CodeGen
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4595
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"5748c79e5a7a6bd1b0bfffc514d8f4f4da92e815/ghc"
 5748c79e/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="5748c79e5a7a6bd1b0bfffc514d8f4f4da92e815"
 Change jump targets in JMP_TBL from blocks to X86.JumpDest.

 Jump tables always point to blocks when we first generate them.  However
 there are rare situations where we can shortcut one of these blocks to a
 static address during the asm shortcutting pass.

 While we already updated the data section accordingly this patch also
 extends this to the references stored in JMP_TBL.

 Test Plan: ci

 Reviewers: bgamari

 Reviewed By: bgamari

 Subscribers: thomie, carter

 GHC Trac Issues: #15104

 Differential Revision: https://phabricator.haskell.org/D4595
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15104#comment:2>
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