[patch tracking] master 20201027213007628602

| Commit | Datetime | Message |
| ------ | ------ | ------ |
| [f443598](https://github.com/libffi/libffi/commit/f4435980fa2da335fe388db431d4a7946a99a2b9) | 2020-10-27T13:06:21Z | Power10 libffi fixes (#585) Power10 pc-relative code doesn't use or preserve r2 as a TOC pointer. That means calling between pc-relative and TOC using code can't be done without intervening linker stubs, and a call from TOC code to pc-relative code must have a nop after the bl in order to restore r2. Now the PowerPC libffi assembly code doesn't use r2 except for the implicit use when making calls back to C, ffi_closure_helper_LINUX64 and ffi_prep_args64. So changing the assembly to interoperate with pc-relative code without stubs is easily done. 	* src/powerpc/linux64.S (ffi_call_LINUX64): Don't emit global 	entry when __PCREL__. Call using @notoc. Add nops. 	* src/powerpc/linux64_closure.S (ffi_closure_LINUX64): Likewise. 	(ffi_go_closure_linux64): Likewise. |

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