gccint: Miscellaneous Register Hooks

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1 18.9.16 Miscellaneous register hooks
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1  -- Target Hook: bool TARGET_CALL_FUSAGE_CONTAINS_NON_CALLEE_CLOBBERS
1      Set to true if each call that binds to a local definition
1      explicitly clobbers or sets all non-fixed registers modified by
1      performing the call.  That is, by the call pattern itself, or by
1      code that might be inserted by the linker (e.g.  stubs, veneers,
1      branch islands), but not including those modifiable by the callee.
1      The affected registers may be mentioned explicitly in the call
1      pattern, or included as clobbers in CALL_INSN_FUNCTION_USAGE. The
1      default version of this hook is set to false.  The purpose of this
1      hook is to enable the fipa-ra optimization.
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