[PPC64] r2 register shouldn't be clobbered in asm
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Description
### HHVM Version
3.24.7
### Operating System and Version
Ubuntu 18.10 using gcc7 (https://gcc.gnu.org/gcc-7/changes.html)
### Standalone code, or other way to reproduce the problem
Building
### Expected result
Build success
### Actual result
hphp/util/portability.h:203:25: error: PIC register clobbered by ‘r2’ in ‘asm’
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