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[patch i386]: Add support of "hotfix" -feature for x64

Hello,

this patch adds the hot-patchabel Win32 feature used by Wine also for x64 
targets. Additionally it adds the missing feature part of adding prefix 
before function as hot-patchable area, as defined by win32 ABI.

ChangeLog gcc/

2010-06-30  Kai Tietz  <kai.tietz@onevision.com>

        * config/i386/i386.c (ix86_function_ms_hook_prologue): Enable x64 
support.
        (ix86_expand_prologue): Likewise.
        (ix86_handle_fndecl_attribute): Likewise.
        (ix86_asm_declare_function_name): New function for 
ASM_DECLARE_FUNCTION_NAME.
        * config/i386/i386.h (ASM_DECLARE_FUNCTION_NAME): New macro.
        * config/i386/cygming.h (ASM_DECLARE_FUNCTION_NAME): Removed.
        (SUBTARGET_ASM_DECLARE_FUNCTION_NAME): New macro.
        * config/i386/i386-protos.h (ix86_asm_declare_function_name): New.
        * doc/extend.texi: Adjust documentation about ms_hook_prologue
        attribute.

ChangeLog gcc/testsuite

2010-06-30  Kai Tietz  <kai.tietz@onevision.com>

        * gcc.target/i386/ms_hook_prologue.c: Add x64 ms_hook_prologue 
support.
        * gcc.target/i386/i386.exp: Likewise.

Regards,
Kai

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