[x86/Linux] fix a typo in FillRegDisplay method.

[ragmani]

#elif defined(_TARGET_X86_) // _TARGET_ARM_
    for (int i = 0; i < 7; i++)
    {
        *(&pRD->ctxPtrsOne.Esi + i) = (&pctx->Esi + i);
    }

An overflow occurs in struct _KNONVOLATILE_CONTEXT_POINTERS because the loop statement starts from Esi variable.

This is struct _KNONVOLATILE_CONTEXT_POINTERS.

1805 typedef struct _KNONVOLATILE_CONTEXT_POINTERS {
1806 
1807     // The ordering of these fields should be aligned with that
1808     // of corresponding fields in CONTEXT
1809     //
1810     // (See FillRegDisplay in inc/regdisp.h for details)
1811     PDWORD Edi;
1812     PDWORD Esi;
1813     PDWORD Ebx;
1814     PDWORD Edx;
1815     PDWORD Ecx;
1816     PDWORD Eax;
1817    
1818     PDWORD Ebp;
1819 
1820 } KNONVOLATILE_CONTEXT_POINTERS, *PKNONVOLATILE_CONTEXT_POINTERS;

This is stuct _CONTEXT.

1751 typedef struct _CONTEXT {
...
1768     ULONG   Edi;
1769     ULONG   Esi;
1770     ULONG   Ebx;
1771     ULONG   Edx;
1772     ULONG   Ecx;
1773     ULONG   Eax;
1774 
1775     ULONG   Ebp;
1776     ULONG   Eip;
...
1785 } CONTEXT, *PCONTEXT, *LPCONTEXT;

[dnfclas]

@ragmani,
Thanks for your contribution.
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Thanks,
.NET Foundation Pull Request Bot

[ragmani]

cc @parjong

[dnfclas]

@ragmani, thanks for signing the contribution license agreement. We will now validate the agreement and then the pull request.

Thanks, .NET Foundation Pull Request Bot

[janvorli]

LGTM, thank you for catching this!